Unohana's Bankai has nothing to do with melting flesh. She says in the chapter that it is used to heal herself so she can keep on fighting. Zaraki turning into a half skeleton is all in his head. It is part of his mental blocks. He says that he hasn't been seeing this fight clearly, which is why when he realizes what that fight was truly about he wasn't a skelton anymore. Her Bankai's release looks cool, but its' affect is really nothing impressive. I would say it is like Tsunade's justu she used against Madara to continually heal herself, but I believe she can only heal herself during its release, or else she would just heal herself again and save herself from dying.
Last edited: