User blog comment:Xilinoc/Ch. 575 - THE KILLERS HIGH/@comment-24153155-20140404002617/@comment-11051098-20140407224329

I think you can be sure about that. I doubt Kubo would set up Unohana to die for the sake of unlocking Kenpachi's full power, only to have him continue his old (dis)habits. He probably has a plan for Kenpachi.