Board Thread:General Discussion/@comment-24382631-20140110234616/@comment-8986886-20141206114424

Nine Tails13 wrote: ...and if he were to be decapitated in that state, or in any state, I doubt his Regeneration could support that, as his Hollow Regen wouldn't be able to replace such an intricate piece... Aizen never acquired any Hollow powers, though. The regeneration was done by the Hogyoku.