User blog comment:Xilinoc/Ch. 560 - Rages at Ringside/@comment-29183117-20131204115058/@comment-11051098-20131204231342

Wonderweiss was created for the sole purpose of sealing Ryûjin Jakka and fighting Yamamoto. As we could see, even a captain as physically strong as Kensei didn't manage to beat him. As far as I see, only Yamamoto had the power to kill Wonderweiss, but that doesn't make Kensei weak. Wonderweiss was simply created to be that powerful, maybe more powerful than Kensei could ever become.