User blog comment:Masterchickfila/Yachiru and Kenpachi/@comment-25455190-20160406191533

I think it could be a number of things. One is that she was his zanpakuto spirit all along which is a definite possibility since it was stated that he was so out of tune with his sword and it could have formed Yachiru to be able to interact with Kenpachi, another is that maybe she absorbed some of his power because of the sheer amount he has and now is giving it back to him. She could even be something created by Kenpachi himself, sort of like a split personality or like Zangetsu, something made of Kenpachi's power, probably as a result of his interaction with Unohana, and now she knows that Kenpachi is ready to take on his full power again so she's given him the power she had stored. Isane did say that Yachiru's zanpakuto release was quite unusual so maybe that was made of the power that she had from Kenpachi or maybe her shikai's power will merge with Kenpachi's. I'm looking forward to finding out.