User blog comment:Xilinoc/Ch. 579 - THE UNDEAD 6/@comment-2211792-20140508131732/@comment-24913480-20140508145652

However, Gremmy was just a brain in a jar and his body was just a figment of his imagination. He said he "perfectly imagined" Kenpachi's power = he gained the same power/spiritual energy/ reiatsu that Kenpachi had BUT his body wasn't as strong as Kenpachi's body so he died. Now, if Gremmy meant that his brain itself (= his real body) couldn't handle all that power then his death makes sense. But if not, if his "FAKE" body that vanished was what couldn't handle the power then his death was just bad writing. That's like saying he could take it but he couldn't take it.