User blog comment:Xilinoc/Ch. 576 - THE KILLERS HIGH 2/@comment-11446176-20140411034451

I just had a thought...

What if kenpachi is only using his Zanpakutou now, because Gremmy has doubled himself?

Down to his belief fights should be one-on-one, referring back to his fight against ichigo where you work with your zanpakutou to both get stronger?