Okay.

How's this for theory:

You remember the excerpt from book the fourth:

He said my blood would make him stronger than if he'd used someone else's," Harry told Dumbledore. "He said the protection my--my mother left in me--he'd have it too. And he was right--he could touch me without hurting himself, he touched my face."
For a fleeting instant, Harry thought he saw a gleam of something like triumph in Dumbledore's eyes. But next second, Harry was sure he had imagined it, for when Dumbledore had returned to his seat behind the desk, he looked as old and weary as Harry had ever seen him...

Over and out.

Okay. So this gleam of triumph is obviously important.

I think what Dumbledore's figured out is that Harry and Voldemort are now permanently bound and that--wait for it--if Harry dies, Voldemort dies.

Go ahead, you can laugh all you want.

BUT WHEN I'M WRONG RIGHT...