I wonder if Tsukikura knew the human Hana, and hated the "God" she became? In any case, if there were handicapped people in the higher levels of the towers, he just killed them offscreen with his little stunt, the bastard.
Obvious twist, terrible execution. Pacing of the past few chapters has been pretty bad (rushed.) Manga generally gives off the feeling that someone told the author "Okay, you got a few more chapters to tell your story, finish up" Good premise though.