User blog comment:Xilinoc/Ch. 599 - Too Early To Win, Too Late To Know/@comment-2211792-20141003050431/@comment-25247258-20141006201305

Here's my theory: Zennosuke, Keigo and Don Kanonji all got warped by being exposed to Aizen's uber-reiatsu and are now each as powerful as him. They also got trained to fight by Urahara, Isshin and Unohana, and have new abilities called Plotkai, which are one level above Resureccion Segunda Etapa