I'm kind of shocked at all the people who think that
Angel is the rat...clearly he has some connection with
scratch, but it's not something he's happy about. Also he's in the room with
Pippin CONSTANTLY, and Pippin never reacts to him....it's after he leaves and someone else comes in that he reacts and gets nervous. It also could not be
Kelly, as she was in the room for quite some time. It's POSSIBLE that it's
Riley, but I see no reason for her to betray anyone.
Kalani is the most logical conclusion, as he seems to have had motive (protecting this "
Hannah" girl, which we mostly seem to think was the girl that was assassinated at the
golf course) and the access (EDIT: My only problem with this is that
Michael or Angel specifically say that Kalani was with
Datu the entire time, and Datu would have no reason to lie for or protect Kalani...there must be something that's missing). They say Kalani was also in
the other tower...maybe he was also planted there by
the mallers. After that place got overrun, he was just chillin in
the Arena until he was rescued. At that point, he contacts the mallers again to say he wants to come back to see Hannah, and they ask where he is...he tells the "another tower" and things spiral out of control from there. I like the theory that his journal is what's in bills desk, along with a long range walkie of some variety that
the tower occupants do not know about.
As far as who survives, it's gotta be Angel somehow, along with
Burt. Kalani living through a fireball explosion makes very little sense, but I will admit, after a second listen after reading all of the comments on the forums, it DOES sound like Scratch is walking on metal....but it doesn't have to be the chopper, it could be the exploded tankers for all we know.
Saul and
Victor definitely live, and will probably end up saving
Lizzy, Burt and Angel.