VidjaGamez summed up my thoughts rather well, with the exception being at the end there. I'm am not at all inclined to believe Kalani is still alive, however, Scratch may have collected his body just to be a bastard, thinking she can return it to Michael the way John's body was returned to her.

But yes, I agree with VidjaGamez and most of what Nik is theorizing; Kalani may have contacted the Mallers when arriving at Michael's Tower, then realized that he could possibly use his new allies to take out the Mallers completely. I am assuming he fired the shot that jump started the inevitable war.

My biggest questions center around Hannah and her current state. Is she dead or alive? Here is what keeps me wondering:

1) Girl at the Golf Course This seems to be a popular theory; that Hannah was the red headed girl at the golf course who was taken in place of Lizzie. Of course if this was Hannah she is now worm food on a par 4, and this would certainly lead Kalani to sacrifice himself, both out of vengeance of his deceased daughter and to protect his good friends in the Tower. But I'm not quite sold on this thoery yet because I have no evidence that Kalani was ever told the details of what took place on the golf course. I'll have to go back and listen to chapter 24 very thoroughly. It could be that as little as "they swapped some red headed girl for Lizzie at the golf course." If Kalani heard that I imagine he could assume his Hannah was killed, but we don't have evidence that anyone told him this, yet. It would suck if the Mallers had more than one red headed girl (if Hannah is indeed a red head) and Kalani, assumed his daughter was executed but it just ended up being some random red head. This leads me to the next possibility:

2) Hannah is still Alive Not much has been mentioned about Scratch's comment in chapter 24. Nik mentioned it and forgive me if anyone else did, but anyway Scratch says she would be willing to swap two Tower members in her captive for Pegs. We know Scratch has Lizzie, but the other person in her keep is a mystery. It could be Lizzie's unborn child, Skittles, or Hannah. I'm willing to bet my Batman boxers that it is Hannah. But Kalani's line just before he kamikazes, "that girl...that was my Hannah" really throws me for a loop as it sounds as though he is talking about her as though she were deceased. Which leads me to my last possibility:

3) Hannah is D-E-D, dead When Kalani says, "that girl...that was my Hannah" my gears get turning so much that I can actually grow dizzy contemplating the meaning of this. I sometimes interpret it as though Angel is supposed to know who that girl is. I then think what girl did Angel come into contact with? Did they tell him about the red head who received a field lobotomy? Or could it be some other gal? It is a very slim chance, but I was thinking what if that girl that Riley and Angel tried to save outside the Arena was Hannah. While trying to escape the Arena Kalani may have seen her corpse. It's a very slim chance though since we didn't get any kind of emotional reaction from him at the time so I very, very much doubt this possibility. If Hannah is dead and Kalani knows it, then it would make sense as to why they find him in such a terrible state at the Arena. He could have resolved to let himself die, then settle on vengeance on the Mallers. Also, at some point he may have come to terms with her death and decided he could live on. That would explain his want to get the hell out of the Tower and go to some place else, far away from the Mallers. "That girl...that was my Hannah" could also be Kalani referencing to her in his journal, as if to say, "Hey, that girl you are going to read about, that was my Hannah...my little angel." Or it could be a reference to the red head on the golf course. It is too hard to say.

I am still leaning towards very likely possibility that Pippin is very much involved with the Mallers blackmailing Kalani into being a rat. Hell, Pippin is kind of a skeevey bastard. We may end up hearing a very difficult-to-bear rape scene. I really hope not though.