As much as it pains me to say/type this. Kalani was the rat. Angel never had the time to be the rat. Angel and Burt are most likely still alive as scratch says something to the effect of "I've found what I was looking for". Burt is always referred to as "old man" by Scratch, so he's alive and in bad shape (also they have sherly if they have him). Saul and Victor went running off after the Hummer got flipped (goodbye hummer, you lasted two seasons). Also, Angel wasn't IN the tower when it fell, he was ON TOP of it. Also, I believe Mr. Wiskers is still alive (he's a fighter).