User blog comment:Xilinoc/Ch. 578 (I'm not gonna spoil the title like Schiffy did)/@comment-29183117-20140423143056/@comment-11051098-20140423190257

I got the understanding that by trying to make himself strong enough to kill Kenpachi, his body grew in size faster than what was safe. In other words, he grew stronger so quickly that he killed himself instead. I gotta agree with Kenpachi, it was kinda stupid. And definitely unexpected.