User blog comment:Xilinoc/Ch. 639 - BABY,HOLD YOUR HAND 2/@comment-2211792-20150820080309/@comment-24531362-20150821021543

Could it be that possession of forbidden Soul King knowledge is why he was thrown into Maggots Nest, where the Onmitsukido held those Shinigami deemed dangerous to Soul Society and where Mayuri was still the only one chained?