Roy is the most likely, but how? Bradley mentioned ways he can be manipulated, but I can't imagine he'd be very eager to do anything the bad guys want him to do, especially after seeing Ed get sucked in (and my inner fangirl was sqee'ing that ROY was the one who called after Ed).

I hope this means Al's body and soul will come together - but it's going to be interesting to see how they get the soul back where it should be. All Barry did was kill himself.