User blog comment:Xilinoc/Ch. 651 - The Theatre Suicide SCENE 5/@comment-2120712-20151112092950/@comment-11293956-20151112125508

Kyokotsu is part of Shunsui's zanpakuto, not Nanao's. At the end of the last chapter, he simply called out the name to summon the spirit that had Nanao's sword.