User blog comment:Xilinoc/Ch. 650 - THE THEATRE SUICIDE SCENE 4/@comment-5693502-20151105121039/@comment-2220112-20151106232637

This is an interesting story line because Shunsui is considered a dual wielder throughout the entire history of Bleach, even by the creator of the zanpakuto acknowledges their being only 2 dual wielders before Ichigo. I think the translation is wrong and she has been using his zanpakuto and she is returning it to him.