User blog comment:Xilinoc/Ch. 576 - THE KILLERS HIGH 2/@comment-1338810-20140409140322/@comment-24282510-20140409221657

Dead/alive don't matter there can not be two two people with the same zanpakuto no matter the name hence Yachiruhttp://bleach.wikia.com/wiki/Yachiru_Kusajishi not having Yachiru'shttp://bleach.wikia.com/wiki/Retsu_Unohana shikai.