Rasputin won't be the traitor, much as I wish she would be. To me, Rasputin is a 1-off novelty character whose novelty ran out 4 years ago and it was a huge mistake to bring her into the main continuity, so I'd welcome anything that removes her from the line. But the point of having the traitor is that it's supposed to be someone shocking who people would have some sort of emotional reaction to, and no one would care at all if it was Rasputin.