Board Thread:General Discussion/@comment-13497263-20130805195632/@comment-893506-20130805212054

Namikazemia wrote: yes to kaien´s part. but masaki didnt killed him he "fused" with her. hence isshin linking his soul to hers in order to save her from hollowfication.

Uh, no, he didn't "fuse" with her. Aizen made White to be able to Hollowfy others by biting them. Metastacia was the only Hollow in manga canon that could fuse with others.