User blog comment:Xilinoc/Ch 649 - The Theatre Suicide SCENE 3/@comment-1338810-20151029154024

Isn't the smaller ninja girl spirit supposed to represent one sword of Katen Kyōkotsu, while Ohana represents the other? That's how it was in the filler anyway. Rather than comparing them to old Zangetsu vs. young Tensa Zangetsu, they're more like Hollow Ichigo and the Old Man - one spirit for each sword.

That's probably going to be the next move for Kyōraku, an attack that involves both Ohana and the other one ("Honeko" maybe? :p )