Potters as their own Secret Keepers?

[Arya]

No: HPFGUIDX 87099


Arya 1st wrote:
Ok, it has just occurred to me...if Dumbledore was able to be the
Secret Keeper for the Order and easily come and go about Grimmauld
Place, then why couldn't either Lily or James have been the Secret
Keeper for when they went into hiding?
<snip> 
Also-- what happens if a Secret Keeper is killed? Ooh--since
the secret is locking within the *soul*, what happens if a Dementor
kisses that person and sucks out their soul?


Mandy wrote:
I think you raise two very good points. Perhaps the reason for a
third party secret keeper is because of the danger of keeping your
own secret. The danger being that if you die the secret dies with
you, and whatever is in hiding remains in hiding for the rest of
eternity. <snipped>

Arya again:
But wouldn't that be wonderful if you wanted to remain in hiding?  If the secret 
was "The Potters are in hiding/living at 123 Red Lion Lane in Godric's Hollow" 
then wouldn't that just be even safer if the secret keeper either (a) had their 
identity kept secret by a second Fidelius Charm or (b) dies, leaving no 
possible way for anyone to ever breech the secret of the charm?  

It's not like they're lost to the world for all eternity, really.  They can receive 
Owl Post I reckon (maybe the secret keeper has to tell the owl, but still) and 
they could still leave that place and come out of hiding on their own.  

Hmm, I wonder why Dumbledore doesn't just put the content of the prophecy 
under the Fidelius Charm?  Can the secret of the charm be "gleaned" from 
one using Legilimency?  Must the secret be willingly given?  I admit, I was 
very surprised it could be passed on by means of a note (such as Harry 
reads to be able to see Grimmauld Place).  What if the note was lost--could 
anyone who read it, see it then? It sure seems like it.  It seems odd that the 
secret on that note was "The HQ of the Order of the Phoenix may be found at 
Number 12..."--why should that prevent Harry from *seeing* the house when 
he didn't know he was looking for the HQ of the OotP, he just needed to see 
where they were going.   Hmmm....

Ug, this is so convoluted.