I looked for the past discussion thread and it was closed so here I am.
I am currently re-reading 7 and I came upon an "Ah-ha!" moment I wanted to share.
get out your book and flip to the King's Cross chapter, pg 709. Read, now think back to book 4 and the "gleem" in Dumbledores eyes upon learning of Voldy using Harry's blood.
Next I site the Rowling interview performed by pottercast. In it she said that the process for making voldy blob into a human was much like making a horcrux. In making voldy-blob into a human, he took Harry's blood and incorperated it into himself.
I think Harry has the opposite of a horcrux. Crazy? Maybe but hear me out! A small piece of Voldy was in harry making the 7th and unintentional Horcrux.We know they can be made w/o your consent. So who's to say when an act of evil is comitted aginst you so henious as someone stealing your blood, you don't get a "credit" of sorts. When Voldy AK's harry he uses Harry's "credit" residing in Voldy, due to blood. Harry comes back with the Horcrux inside of him having been destroyed by AK.
If Harry had struck first rather then giving himself up, he would only have distroyed the "credit" inside of Voldy, making it impossible for him to come back.
So as Voldy became Vapormort after attacking the potters, harry as well became a vapor like substance and returned to his unscathed body...
I figured it out! Woot for me!