You quote thoroughly which is brillant. I like a bit of canon to hang my great leaping theories and bizarre tangents on. Talking of which:

What do you think about the idea of Voldy owing Harry a debt? Does this explain Dumby's 'gleam of victory'???
What form does a debt take do you think?? Does it mean that you can't kill the owee?? Kinda like a brother wand thing; the killing curse just won't happen properly on someone you owe a debt to???