His portrait his up. He's dead. Can we move on?
And, Asphodel, that's a bit contradictory what you said

.
I'm going to go out there and point-blanc say that no one can survive a properly casted AK curse. Harry was just saved bacause of love-magic. DD did not survive.
Does Harry just not count as a person then?

Or that Voldemort didn't cast it properly (fat chance, I'd say he was pretty good at it by then.)
It is evident, yes, that there is no official counter-curse for Avada Kedavra, but after 6 books of watching a character justly named "The Boy Who Lived", I would have though that, maybe, we could have come to the conclusion that it
might somehow be possible to survive.
Because it's
happened. There is no official counter-curse, but it's
happened, so you can't say it's impossible.
[Couldn't resist saying it, even though I know what you meant

]
But Dumbledore is dead... come on. Move on.
We should be dicussing
why he died.
As as for the non-verbal being cast at the same time as the Avada Kedavra by Snape, I rather think that two spells can't be cast at the same time, and he would have had to concentrate quite hard for Avada Kedavra, leaving the other one in the background. Woldn't have happened, in my opinion.
Couldn't.