Gleam in Dumbledore's Eye- theory that may or may not have been discussed before

[ask me]

No: HPFGUIDX 46955

  Ok, we all know that there was a gleam in Dumbledore's eye at the
end of GoF. I also know that it's been debated endlessly (at least in
a.f.h-p) and that people are tired of it, but I have a theory that 
I've never seen before (but just because I haven't seen it doesn't 
mean it's not out there). 

  At the end of PoA (Ch. 22 to be exact) Harry and Dumbledore have 
the following exchange:

  "But—I stopped Sirius and Professor Lupin from killing Pettigrew!
That makes it my fault if Voldemort comes back!"
  "It does not," said Dumbledore quietly. "Hasn't your experience 
with the Time-Turner taught you anything, Harry? The consequences of 
our actions are always so complicated, so diverse, that predicting 
the future is a very difficult business indeed... Professor 
Trelawney, bless her, is living proof of that... You did a very noble 
thing, in saving Pettigrew's life."
  "But if he helps Voldemort back to power
  "Pettigrew owes his life to you. You have sent Voldemort a deputy
who is in your debt... When one wizard saves another wizard's life, it
creates a certain bond between them... and I'm much mistaken if 
Voldemort wants his servant in the debt of Harry Potter."
  "I don't want a connection with Pettigrew!" said Harry. "He 
betrayed my parents!"
  "This is magic at its deepest, its most impenetrable, Harry. But
trust me... the time may come when you will be very glad you saved 
Pettigrew's life."

  This makes me think that there is a gleam in Dumbledore's eye, not
because Voldemort used Harry's blood, but because he used Peter's 
arm. Maybe Harry has some sort of protection deeper even than his 
mother's sacrifice. Maybe, even though Voldemort can now touch Harry 
he can't kill him because he is now in Harry's debt through Peter.

  I know it's probably been said before but I've never seen it so I
thought I'd post my two cents.

-Casey