User blog comment:Xilinoc/Ch. 668 - BIGGER,FASTER,STRONGER/@comment-24574959-20160331134647

it's pretty clear now that she is, i don't know what else she could have meant by "using her properly". first her odd disappearance when he first released nozarashi, the power of her shikai being unheard of, it was pointing to the fact that she was his zanpaktou spirit. lol i don't know what other confirmation we need