I think pretty much everyone from the Tower is dead, all the nameless people and Steven. I think Skittles is the other person Scratch was talking about, the Mallers just do not know he is not actually from the Tower. Burt is the old man, Scratch found Angel and put him with Burt who may or may not be dead. They mentioned that whoever they found was breathing but looked bad, so assuming it is Angel, he is alive... for now.