User blog comment:Xilinoc/Zanpakutō & Tōjū arcs - Review/@comment-5847836-20140123021224

Very nice review. I actually enjoyed the Zanpakutō arc fairly well, although the resolution was rather weak. Tōjū arc was just rather bland. Not terrible, but not great, although it did have some good episodes.

As for Muramasa becoming a Hollow, as I understand it, Nimaiya explained that all Zanpakutō are created from Hollows. Thus Muramasa being able to consume other Hollows and displaying Hollow abilities makes sense.

And Muramasa not being able to control "old man Zangetsu" like the others lines up nicely with the revelation that he's actually a Quincy spirit fragment, not a Hollow/Zanpakutō.