Kilani could have just as easily seen the downed Hawaian airliner and tied that into his story. Did Kilani call Chinwei "CJ" first or did Samantha? If Samantha or anyone else who was from the "other tower" told Kilani the story maybe he misheard Chinwei name. If Kilani stole the story he could have misheard Chinwei name and decided to call her "CJ". So if somehow other survivors were found he could have deniability ("must be another tower with some CJ person)
2) Chinwei is totally not alone, my money is on them being confronted when Saul & Victor are about to leave the building.
3) not only is Burt alive, but I think the messed up body is Kilani. Hence Scratchs suprise at seeing the messed up body. That means Angel could be alive. My understanding is that the front face of the tower collapsed, so part of the tower is still standing. Then Angel could have stayed on the building and repelled after the dust settled. But where would he go? Colony? Find skittles (back to the base?) Maybe found by Chinwei and being held in a makeshift prison (where Saul and Victor will soon meet up with him)