http://terri-testing.livejournal.com/ ([identity profile] terri-testing.livejournal.com) wrote in [community profile] deathtocapslock2011-08-31 11:09 pm

Possession of the Cloak


“His passion … was the work he had taken over from Illyan….

No. The work Haroche had taken away from Illyan.

Oh.

… I’m blind, blind, blind! Motive! What’s an elephant got to do around here, to advance and be recognized?”
Miles Vorkosigan in Memory, by Lois McMaster Bujold

A word in a prepositional phrase can sometimes make all the difference in the world.

Why was Albus in possession of the Cloak at the time of the Potters’ deaths?



Marionros wrote in answer to my post positing that Albus hadn’t originally suspected Tom of creating Horcruxes because Albus assumed instead that Tom (who’d apparently come into possession of the Resurrection Stone) was hunting Hallows:

This might be the reason why Albus so desperately wanted James (and thusly James' minions) in his Order straight out of school, and why Albus let the Marauders run wild while still at school. James was the descendant of the Peverells and the owner of the Cloak. Heaven forbid that James ever, ever threw in his dice with Tom's lot.

Well. If Albus had had his eye on the Peverall/Potter cloak for years….

*

We listened to Albus confirm all Harry’s guesses on the matter at King’s Cross:

“You have guessed, I know, why the Cloak was in my possession on the night your parents died. James had showed it to me just a few days previously…. I could hardly believe what I was seeing. I asked to borrow it, to examine it. I had long since given up my dream of uniting the Hallows, but I could not resist, could not help taking a closer look…. and then your father died, and I had two Hallows at last, all to myself!”

His tone was unbearably bitter.

“The Cloak wouldn’t have helped them survive, though,” Harry said quickly. “Voldemort knew where my mum and dad were. The Cloak couldn’t have made them curse-proof.”

“True,” sighed Dumbledore. “True.”

“…somehow, we never discussed the Cloak much, Harry. Both of us could conceal ourselves well enough [truer words!] without the Cloak, the true magic of which, of course, is that it can be used to protect and shield others as well as its owner.”
(DH 35)

So. Moments after agreeing with Harry that the Cloak couldn’t possibly have helped James or Lily, Albus contradicted this to tell Harry that the Cloak’s “true magic” is that it can be used to shield oneself and others simultaneously. I.e., that Lily maybe could have used it to sneak past Tom with Harry in her arms, had she been bold and cool-headed enough.

And had she in fact possessed the Cloak.

Which Dumbledore took before Harry’s birthday, not in late October as he told Harry. And which he kept. For months.

Despite knowing that the Cloak’s rightful owner, and his family, were being hunted. In mortal peril. In need of a way to hide.

Lily’s letter to Sirius, written in early August: “James is getting a bit frustrated shut up here, he tries not to show it but I can tell—also, Dumbledore’s still got his Invisibility Cloak, so no chance of little excursions.” (DH 10)

Still.

Meaning, Sirius had already been told that Dumbledore had taken the Cloak. However, it’s news to be imparted that Peter visited “last weekend” and shared the news about the McKinnons. So as of Harry’s birthday it had been a week, at least (most likely—not likely much less, and quite possibly much more, depending on how often Lily sees or writes Sirius) since Dumbledore had “borrowed” it.

And it’s news to be imparted that Dumbledore still has it.

Meaning, Sirius might reasonably have expected the item to have been returned by now.

That “still,” and the mention of James’s frustration at being denied his little excursions, carries a very faint whiff of implication that maybe James hadn’t expected the loan to go on for quite so long. “May I borrow it for just a few days, to examine it more closely?”

A few days which somehow, inexplicably, dragged out for three months. To the end of James’s life.

*

That Cloak, which “can be used to protect and shield others as well as its owner,” was not kept from its rightful owner’s possession despite Albus’s concerns that Lord Voldemort might be catching up to the Potters. Albus kept it because of those concerns.

*

Albus was willing, while he thought there was no immediate chance of wresting the Stone from Tom, to leave the Cloak in the custody of his loyal supporter, knowing full well that he could “borrow” it whenever he chose.

If there was no imminent prospect of uniting all three, having indirect access was quite sufficient.

But Albus couldn’t risk Tom getting hold of the thing when he killed the Potters. Getting two of the three. Needing only to defeat the Deathstick’s master (which might be done by treachery or guile or chance; Tom didn’t have to be more powerful or brilliant than Albus in general to win a momentary, wand-stealing victory) to complete the set.

So once Albus decided Tom might be closing in on James and Lily, he took the Cloak.

Decreasing their chances of surviving the coming encounter, of course, but for the very best of causes.

For the Greater Good, really. “To save others from it.” To protect it.

We should applaud his selflessness.

Clap.

Clap?

[identity profile] madderbrad.livejournal.com 2011-09-01 07:24 am (UTC)(link)
Wow, I love this observation:

So. Moments after agreeing with Harry that the Cloak couldn’t possibly have helped James or Lily, Albus contradicted this to tell Harry that the Cloak’s “true magic” is that it can be used to shield oneself and others simultaneously. I.e., that Lily maybe could have used it to sneak past Tom with Harry in her arms, had she been bold and cool-headed enough.

Excellent.

Mind you, these days I just like to collect Rowling errors - this makes #4,319 :-) - so I'd say this is another one of these. Because there's no way Rowling would have wanted us to think that Dumbledore deliberately placed the Potters in jeopardy like this, right?

Although - for whatever reason - he *did*. Thanks to your observation. All so Harry could have his nifty Cloak in book #1.

But Albus couldn’t risk Tom getting hold of the thing when he killed the Potters. Getting two of the three. Needing only to defeat the Deathstick’s master (which might be done by treachery or guile or chance; Tom didn’t have to be more powerful or brilliant than Albus in general to win a momentary, wand-stealing victory) to complete the set.

Yes, but moving the Cloak from Potter to Dumbledore does nothing in reducing the probability of Riddle completing the set. Actually, it *increases* the probability - with Dumbledore holding both Hallows then one single defeat of the headmaster will give Tom the set. Whereas by leaving the Cloak with James the number of battles/tasks/risks was doubled.

I suppose if one states that Voldemort was going to kill the Potters anyway then it's two-all. But still, taking the Cloak off James but only to keep it himself would not have made it any more difficult for Riddle to get all three.

[personal profile] oryx_leucoryx 2011-09-01 02:26 pm (UTC)(link)
OTOH if Harry was somehow going to vanquish Voldemort, were 2 Hallows going to be in the hands of the Potters? Will it become a fight between Albus and James?

Re: 2 Hallows in the hands of James?

[personal profile] oryx_leucoryx 2011-09-01 07:52 pm (UTC)(link)
We don't know how closely the wizarding version of Merlin's biography follows our Arthurian legend, but Merlin's first act was to arrange for Arthur's conception. Which ties with Hwyla's speculation that the Prophecy was actually made before Harry and Neville were conceived.

Albus with Merlinesque aspirations? He must have seen himself as one step better than the original - being gay and celibate he was safe of the chance of being trapped in a tree by Nimue.

What was the reason given for Arthur's fostering? Because Uther was still alive.

Re: 2 Hallows in the hands of James?

[identity profile] condwiramurs.livejournal.com 2011-09-02 04:53 am (UTC)(link)
Haven't read Aurthurian legend for a while, so this might be off-base, but I believe at the time it was a normal practice to foster one's sons out to neighboring lords, and take theirs as foster children into your house, to be educated there, as a sort of exchange of hostages to prevent bloodshed.

Re: 2 Hallows in the hands of James?

[personal profile] oryx_leucoryx 2011-09-02 03:02 am (UTC)(link)
Of course with Harry fortunately being a first-born, Albus was yet another step ahead of Merlin - no Morgan le Fay, no danger of producing Mordred. Now I'm wondering if Albus had anything to do with the sudden appearance of Harry's 'chest monster' in HBP because of the role of women in the downfall of Arthur (and Merlin). I'm not sure how this makes sense, but anything is better than Rolwing's horrible writing of the 'development' of this relationship.

Anyway Terri, these last two threads are such gifts! For years I was thinking of what Albus knew or thought he knew about Tom from a Horcruxes perspective. Rethinking it all from a Hallows perspective is like seeing a Necker Cube shifting.

[identity profile] madderbrad.livejournal.com 2011-09-01 09:42 pm (UTC)(link)
Well, that's a secondary consideration; Terri's observation is that Dumbledore's main goal was to keep the set away from Riddle.

Once Voldemort was dead Dumbledore wouldn't care *who* had the Hallows, of course ... :-)
sunnyskywalker: Young Beru Lars from Attack of the Clones; text "Sunnyskywalker" (spandex jackets)

[personal profile] sunnyskywalker 2011-09-01 04:50 pm (UTC)(link)
If only there were some hidden room where Dumbledore could just ask, "I need a hiding place from which the person variously known as Tom Riddle or Voldemort can never, ever retrieve any objects I place inside..."

[identity profile] annoni-no.livejournal.com 2011-09-02 02:49 am (UTC)(link)
The only question I have is whether the room is even CAPABLE of fulfilling such an order. Malfoy was able to keep Harry out under all conditions, but Harry "The Chosen One" Potter is, to be quite, quite honest, more than a bit thick and has proven himself canonically to be generally incompetent in dealing with that room.

Room master Neville, on the other hand, was able to be even more specific and secretive than Malfoy, but according to Seamus, even under his direction there had to be someone in the room *maintaining* their current instructions at all times. Which leads me to believe that while the room *can* be used for hiding things, that's not what it was *designed* for, and is more of a useful glitch or spell hack that came later. The original room is the one Harry found trying to HBP's potion text: a glorified storage closet that continuously updated itself to accommodate the never ending stream of items that needed to be tucked away. Until some clever little humanoid convinced it to only a display a particular subset of its items at once in an easily accessible manner so they didn't have to hunt through miles and miles of junk.

Which is why Tom's horcrux ended up in the middle of a junk heap, regardless of what instructions he gave the room to keep it hidden and safe for all eternity: he wasn't there to maintain the order, so the room filed it away with everything else according to its original operating instructions.
sunnyskywalker: Young Beru Lars from Attack of the Clones; text "Sunnyskywalker" (spandex jackets)

[personal profile] sunnyskywalker 2011-09-02 03:49 pm (UTC)(link)
That would make sense as the way the room works (it's always bothered me). Hard to say, though. When they create the DA room, are the shelves and books etc. all pulled from the junk room, or does the room create temporary ones every time they open it, or do those actually become permanent objects once created and sent back to the junk room when not in use? (If the latter, then I'd ask the room to create a Tom-proof box. Or I suppose Dumbledore could put Hallows in a mokeskin pouch in the room - since we have a handy magical object which was never useful, someone ought to put it to good use.) Also, since the room can create a tunnel to elsewhere, maybe it could create a tunnel or portal to somewhere that is Tom-proof, if such a place exists. Or pull up a book with instructions for making a Tom-proof hiding place. I really wish JKR had made the room's limits clearer.

Of course it would have been much simpler if Dumbledore had just gotten over his obsession and destroyed the damn things, but we know that wouldn't ever happen.

[identity profile] dracasadiablo.livejournal.com 2011-09-02 04:55 pm (UTC)(link)
It is annoying.
The room limits are never given in the books. We don't even know how it works.

From all we know somebody could have activated the room and said "I need a secure place, with all Voldy's horcruxs safely contained in it, plus books explaining how to destroy them and all tools to do it."
It would have saved us from the ridiculous scavenger hunt and the camping trip from hell.

[identity profile] annoni-no.livejournal.com 2011-09-06 05:54 am (UTC)(link)
Having the room generate its contents from scratch each time feels like vastly over-complicating, not to mention overpowering, the room. The sheer expanse of *things* that have been accumulated in that room over the centuries is probably enough provide almost anything anyone could possibly need.

If it is generating new items each time, how does it keep track of what spell books have been published, or what artifacts, tools, and other sundry equipment has been developed and what their specifications are? And why would anything the room displays ever be described as 'old'? Besides which, the room hasn't actually displayed much in the way of sentient understanding if we trust Dumbledore's story of the room generating multiple chamber pots instead of the one he actually needed. Further, Neville and the others had to constantly finesse the room's output: it didn't actually give them what they *needed* so much as what they were focused on *wanting* at the time, otherwise they would never have had a time where they were desperate for food - the room would have alerted them to its tunneling abilities from the beginning.

Re: Room's Requirements

[personal profile] oryx_leucoryx 2011-09-07 02:00 am (UTC)(link)
(And he shuts the room specifically against Harry only; Sybil gets in with no problem. Oops.)

Not exactly. Neither Dobby nor Kreacher could get in either. I think Draco shut the room to *everyone* (or anyone not explicitly with him) while he was inside. Sybil got in because at that exact moment Draco was outside the room, at Borgin and Burkes (via the cabinet). He returned to find her there, tossed some Peruvian darkness powder and ejected her from the room (or perhaps the room ejected her when Draco returned and his instructions became valid again).

The room Draco was using was the general storage version. When Harry entered to hide the HBP's book he was able to see the cabinet. But he didn't know that was what Draco was working on there.

Do we know the other times he tried to enter the room Draco wasn't there?

but what if this Room were another of Rowena's fabled inventions?

Which makes it the most suitable and natural place to keep her Horcruxified diadem.

Re: Room's Requirements

[identity profile] annoni-no.livejournal.com 2011-09-07 06:43 pm (UTC)(link)
"(What if Tom thought the CASTLE were somehow responsible for bringing secret or discarded items there? The Castle's junk-room doesn't seem grand enough to be Tom's Horcrux-depository--but what if this Room were another of Rowena's fabled inventions? The first use of Wizardspace. Plus a spell, according to legend, that identifies and tidies up magical "unclaimed property:" castle artifacts deemed by the head to be superfluous/dangerous, abandoned experiments, lost enchanted items once the rightful owner graduates/dies.... But her spell doesn't Vanish these objects because they all embody magical knowledge, which should never be destroyed.)"

But where in canon is there any evidence for such a legend? Shouldn't it have come up in conjunction with the minor theorizing we do get about the Room, considering this would it put on par with Salazar's Chamber of Secrets in terms of grandiosity, besides being several thousand times more useful? How is this more plausible than the idea that Tom was pacing back and forth in a lightly trafficked corridor (possibly before he'd found the Chamber) trying to think of a place he could use as a private retreat for planning/experiments/holding illegal contraband/etc (whatever Tommy *needed* at the time) that was grand enough to satisfy his bloated ego?

If he was still searching for the Chamber, or had recently found it, he might even have been experimenting with spells he'd crafted that were designed to seek out and reveal concealed chambers. All he'd have to do to find the RoR would be pace back and forth before the door several times focused on what he wanted (a grand secret chamber forgotten by everyone but him). If his spell was just sensitive enough to tell him there was *something* unique about that corridor during his initial pass, he could have easily been convinced that he had a legitimate discovery on his hands. Further, there probably wouldn't be any description on record matching the interior the Room displayed for him, so he'd probably be ridiculously pleased with himself. And why wouldn't he think his horcrux was safe there if no one else, even the in the known historical records, knew where the room was or even that it existed in the first place? Beyond that even, if he just wanted a secret room connected to the glory of the Founders, why didn't he actually hide a horcrux inside the CoS, which is also a chamber (he thought) he alone knew the entrance to and where he would have a basilisk acting as guard dog?


Re: Room's Requirements

[identity profile] annoni-no.livejournal.com 2011-09-07 06:43 pm (UTC)(link)
"But--what we do know doesn't rule out someone making hirself a system administrator. Giving it the instruction, "Give my instructions priority over everyone else's, even after I leave the room." As long as no one else had gotten in first with a competing instruction..."

Again, why should we assume such sweeping powers? We may not have anything to rule out such carte blanche authority, but we have nothing supporting it either. Isn't it just as likely that the room can be blocked to others even when the initial 'architect' is away for only a limited time? Personally, my theory is that Draco spend a good portion of his initial time in the room not just trying to fix the cabinet, but experimenting with the limits of the room itself. To keep out anyone but those invited, he'd have a potion brewing the corner - one that took days, if not weeks or months to complete. Then he could give the room specific instructions to retain his surroundings exactly as he had left them, allowing no one else into the room but him (especially not that B*rk Potter and his cronies)until the potion was complete. Wash, rinse, repeat until the cabinet was fixed. This gives him complete authority over one manifestation of the room, but it's not so open-ended and all encompassing that he rules it for all eternity. If he hadn't returned before the potion was complete and had instead just left it there, I suspect the room would have just tucked the full cauldron away in general storage after whatever safety margin of time Draco had given himself had passed without his arrival.

If a mere student, even a prefect, *did* try to impose an eternal command on the room to keep something hidden, or particular people out, or what have you, then I think the Room would try to fulfill that order for as long as possible, maybe even for years (or until that student's graduation), but eventually it would revert back to its basic storage function. The only people I'd be comfortable claiming had such completely authority over the room would be the Headmaster and duly authorized teachers in the school (and then I suspect there would be limits as to what the room was capable of doing).

The Room's enough of a game breaker as it is without assigning it even more power.

[identity profile] madderbrad.livejournal.com 2011-09-03 11:27 am (UTC)(link)
Be careful ... what we arrange for Dumbledore to use with the Hallows can also be employed by Voldemort for the Horcruxes. And then dear Harry would never be able to destroy them all!
sunnyskywalker: Young Beru Lars from Attack of the Clones; text "Sunnyskywalker" (spandex jackets)

[personal profile] sunnyskywalker 2011-09-06 01:46 am (UTC)(link)
True! Unless there's a way to destroy the entire castle and everything in it (with no retrieval option, so if Dumbledore used the hiding option, V could only ignore them or destroy them). But she couldn't even kill the Sorting Hat, so Hogwarts was definitely safe.

Re: The risk of completing the set

[identity profile] madderbrad.livejournal.com 2011-09-02 12:52 am (UTC)(link)
And Albus is less logical than you, and more vain ...

I'll be happy if I can get to his old age. :-)

Moreover, he is looking at a particular crisis rather than the overall hypothetical risk. ... And if Tom is moving aggressively NOW against the Potters, the Cloak is in immediate danger where it is.

So he's making a few mistakes:

a. He's risking the security of the Hallows on the assumption that the Potters will be attacked first. Voldemort could change his mind, after all. Or be laying a false trail with the suspected spy, Snape.

b. He's doubling the amount of work required to keep the Hallow safe. Why move it from A to B if you're only going to have to move it again to C?

So he didn't need to keep it at hand, just out of Tom's. And where he can get at it fairly quickly if he wants. Easy enough. Stick it in a mokeskin pouch and give it to Ab to bury in the goat pen.

Ah, if only Rowling's wizards were that clever! If only Rowling was that clever!

Why, then, we'd have dark lords hiding *Horcruxes* in goat pens and Gringotts vaults and volcanoes and the bottom of the sea and lots of places where a teenage boy couldn't get at them! (After all, he couldn't fetch a sword that was just a few metres down in the bottom of a small frozen pond.)

[identity profile] karentheunicorn.livejournal.com 2011-09-01 01:30 pm (UTC)(link)
With the whole Potters death I have often wondered this. We know Dumbledore seems willing to sacrifice people if he thinks its for the greater good. So, why would he hesitate on letting Voldemort meet up with baby Harry if that eventually meant Voldemort would be defeated. Keeping the cloak not only seems selfish but in a certain way...if Voldie happened to go to the potters, so what, seems like Voldie and Baby Harry meeting might have been what DD wanted. I know the zombie fans and even JKR herself would say NO, Dumbledore would not do that but to me DTCL writers/ and theorists have shown and pointed out many instances where Dumbledore willinly puts or allows Harry and others to be in mortal danger, or even be killed for the greater good. So, why would James/Lily be any more special than the other people Dumbledore claims to care about.

[identity profile] condwiramurs.livejournal.com 2011-09-01 03:11 pm (UTC)(link)
Does Dumbledore ever claim to actually care about them, even? He demands payment from Severus for protecting them, despite the fact that they are *his own fighters* who have already entrusted their lives to him. I highly doubt he would have qualms about sacrificing them if necessary.
sunnyskywalker: Young Beru Lars from Attack of the Clones; text "Sunnyskywalker" (spandex jackets)

Re: Grieving over James and/or Lily

[personal profile] sunnyskywalker 2011-09-01 05:50 pm (UTC)(link)
It looks especially bad in contrast to McGonagall - who doesn't seem to have thought the Potters were the best thing since sliced bread (not that she disliked them, but she doesn't seem like she wants to commission a statue), but still is shocked and distressed that they were murdered. Like most people would be. Even Harry manages to find pity for Draco, whom he despises, and Dumbledore is twinkling after his own followers die?

Re: Grieving over James and/or Lily

[identity profile] sharaz-jek.livejournal.com 2011-09-01 07:22 pm (UTC)(link)
It all depends on why they died. Lily and (to a lesser extent) James died to set up the conditions of Voldemort's disembodiment. It's what they would have wanted. Not that they were given the choice, or even believed it could happen (after all, Albus so magnanimously allowed them to choose an... inferior... wizard to be their Secret Keeper), but who better than their beloved former headmaster and current leader to make that decision for them? All was well.
sunnyskywalker: Young Beru Lars from Attack of the Clones; text "Sunnyskywalker" (spandex jackets)

Re: Grieving over James and/or Lily

[personal profile] sunnyskywalker 2011-09-01 11:59 pm (UTC)(link)
Their deaths did have great benefits, for sure. But I think many people, no matter how happy they were about Voldemort's semi-demise, would still find the idea of a young couple dying and leaving an orphaned baby which they are preparing to leave on an awful family's doorstep in winter sad enough that they wouldn't be chuckling and sparkling. But you're right, that's probably not how Dumbledore would see it. The plan just got tweaked a bit, nothing vital was lost, everything's on track, so we're okay! And I am a brilliant quirky old wizard mentor!

Re: Grieving over James and/or Lily

[identity profile] oneandthetruth.livejournal.com 2011-09-03 06:20 am (UTC)(link)
Lily and (to a lesser extent) James died to set up the conditions of Voldemort's disembodiment. It's what they would have wanted. Not that they were given the choice, or even believed it could happen (after all, Albus so magnanimously allowed them to choose an... inferior... wizard to be their Secret Keeper), but who better than their beloved former headmaster and current leader to make that decision for them? All was well.

And there are still people who doubt this man is a psychopath?

Re: Grieving over James and/or Lily

[identity profile] oneandthetruth.livejournal.com 2011-09-03 05:41 am (UTC)(link)
Albus looked "grim" when he spoke to Severus, his eyes were "sparkling" and he "chuckled" when he saw Minerva. He "bowed his head" to confirm for Minerva the rumor that Lily and James were dead, patted her on the shoulder, and said "I know... I know" heavily.

Eeeewwwww. I became suspicious of Scumbledore in the very first chapter of PS/SS, believe it or not. But this makes him look even more disgusting than I realized at that time.

[personal profile] oryx_leucoryx 2011-09-01 02:22 pm (UTC)(link)
I had long since given up my dream of uniting the Hallows

Hmm. Was this because he wasn't quite sure if the Potter family still had the cloak or because his Order wasn't that effective in getting the Stone from Tom? If we ignore Rowling's response from the Pottercast interview, but instead follow what Albus tells Harry in OOTP, at least the Potters and the Longbottoms had 3 direct encounters with Tom they survived before their respective sons were born. Does Albus' dream of uniting the Hallows explain why he needed a private army of people who do as he says without asking too many questions at a time when supposedly both he and the Ministry were united in the cause of fighting Tom? Was he using the trust of his most loyal supporters to promote his quest for the Hallow he knew to be in Tom's hands? Especially if he believed Tom was keeping it on him to use as needed.
stasia: (Default)

[personal profile] stasia 2011-09-01 06:51 pm (UTC)(link)
When I read, "His tone was unbearably bitter.", I didn't think his bitterness had anything to do with his potential or lack of same to protect the Potters. He was just bitter than he had only two of the Hallows.

*sigh*

Stasia

[identity profile] the-bitter-word.livejournal.com 2011-09-01 07:54 pm (UTC)(link)
This makes a lot of sense, and tracks Dumbledore's life-long obsession with the Hallows, which we are probably supposed to view as his tragic flaw, directly leading to his death as well as the deaths of his sister and Snape, and now, the disposable Potters! Pshaw - the Potter parents didn't listen to him about the Secret Keeper thing, anyway. His sister was an inconvenient burden and Snape was a mean Slytherin. No harm, no foul! Off to heaven Dumbledore goes.

Contrary to what Potter said in King's Cross, Dumbledore did kill when he could have avoided it, or rather, he let those under his command unknowingly sacrifice their lives for his hubris.

[personal profile] oryx_leucoryx 2011-10-13 05:42 pm (UTC)(link)
Meaning, Sirius had already been told that Dumbledore had taken the Cloak. However, it’s news to be imparted that Peter visited “last weekend” and shared the news about the McKinnons. So as of Harry’s birthday it had been a week, at least (most likely—not likely much less, and quite possibly much more, depending on how often Lily sees or writes Sirius) since Dumbledore had “borrowed” it.

Sirius, James and Lily are all in the Order photograph, taken two weeks before the McKinnons died. Since Lily tells Sirius in the letter that she believed Peter's bad mood was because he was mourning the McKinnons their death is probably the most recent one. So Sirius definitely saw the Potters some 3-4 weeks before Harry's birthday.

Since I doubt the Order photo was taken in the Potters' home/hiding place then they were able to leave home that day. My guess is that was when Albus saw the cloak, and he came to ask for it soon after.