User blog comment:Xilinoc/Ch. 590 - Marching Out the ZOMBIES/@comment-1338810-20140723093531/@comment-24384892-20140723095402

I wonder if he Frankensteined Szayel.

I also wonder how he was able to collect Charlotte's body, because he was no where near Karakura Town during the battle. He probably went there sometime after the battle just for the purpose of searching for Arrancar corpses to experiment on. For him, this is nothing out of the ordinary.