User blog comment:Xilinoc/Ch. 668 - BIGGER,FASTER,STRONGER/@comment-957629-20160331154647/@comment-957629-20160401114956

Hmm that is an interesting point but a Zanpakuto spirit is part of that Shinigami. The asauchi he picked up was markedly different from what his sword later became so he's clearly imprinted upon it.

He needs to have a good explanation for why she has her own memories when she' meant to be part of him.