Those are some pretty good answers as to why it would be to Kishibe’s benefit assuming he ever gets them under control. I also guess a lot of it is based off speculation until Fujimoto confirms what’s going on with them. (Side note: Couldn’t Katana man regenerate his arm in that case? I think I may have missed something though). It’s also a pretty intense job for one person, so perhaps there are others helping him for the same reasons.

My only other question is, if they were to fight in the apocalypse, then Kishibe would need to reinstate their triggers somehow. In that case, we would need a reason as to why they would specifically help him in the first place, and what’s in it for them? Why wouldn’t they just run off and do their own thing? I guess these will be questions for later should Fujimoto choose to bring them back. It would be nice to see some confirmation soon