The time traveling theory never worked for me. In fact the introducton of the time traviling ability was a pretty big weirdness on JKR's part. What if Voldemort had got a hold of one of those devices. Weird even thinking about it. I haven't read that fanfiction story..might do that now though.

Any way, my theory involved the transfiguration of an inanimate object to look like Dumbledore's body.