I think dumbledore is alive.My reason for him surviving AK is highly unlikely, but with LV, you never can tell.Since Voldemort is afraid of death, he probably knew whoever drank the potion would be onto him and his horcruxes, right?He wasn't stupid.....I'll give him that much. Anyways, he might have found a way to fix up the potion so that the drinker would be protected from killing curses, but die from a very slow, painful death.With this dude, I wouldn't be shocked. As for the fall, I thought about it and I had an idea. What if DD knew a spell to create some kind of solid dummy of himself?Plus, Hagrid was the only one who touched the body, so you have to take that into account...And that was my two bits