Board Thread:Questions and Answers/@comment-25801533-20150531094407/@comment-5398287-20150531163331

DazzlingEmerald wrote: I think it may have been another speculation between Kein Shiba and Ichigo Kurosaki. All the captains have done this at one point, if not all the shinigami. It's very likely that Kurosaki-kun is even Kein's reincarnation; this would explain how Ichigo is so naturally adept with his skills, beyond being only a crossbreed. I don't think it's possible for Ichigo to be Kaien's reincarnation when Kaien's soul was taken to Hueco Mundo after his death (at least, that's how I remember Aaroniero's explanation going).