Hmm .. you mean the one that was mentioned in the second book? That's a good theory.

And yeah, a director couldn't make JK change the entire story line.

Also, about the Peter theory, could someone explain why its such a bad idea? I mean, when he has Dumbledore working with him, he would be smart enough to impersonate him. Then again, Voldemort would be able to cover up the hand, so it might just be a stupid Death Eater. So I don't get why it doesn't make sense.