User blog comment:Xilinoc/Ch 649 - The Theatre Suicide SCENE 3/@comment-1338810-20151029154024/@comment-493809-20151029221554

I'm thinking the same thing. Back when Shunsui and Ukitake first showed their Shikais, Yamamoto mentioned how they were unique because they had two Zanpakuto. Hisagi's Shikai raised some confusion, but it makes more sense if the two swords were due to the fact that they both had two inner souls - Ukitake was the host of Mimihagi, and Kyoraku was talking almost as if he was the man from the story of the lover's suicide. Maybe somehow Ohana is another soul that joined with him?

It makes a degree of sense, when one considers that Ichigo gained another sword when he started accepting both Yhwach and White as "Zangetsu."