Board Thread:General Discussion/@comment-1351982-20130423233928

Hey guys! Wow, We got a lot of new info with this weeks chapter, it is sure to keep us talking when Bleach goes on hiatus next week due to Golden week (Don't worry, it will be back the following week). Anyway got a quick little theory for you guys so here we go!

My theory is Urahara's Hogyoku uses the spirit energy of shinigami souls, which is why they didn't work on the visoreds. Aizen's Hogyoku is made up of human souls (which shinigami are still technically), which is why many hollowification experiment subjects died. Aizen needed Urahara's Hogyoku to stabilize his own in order to make arrancar and to become a transient being.

So that was my quick theory for the week, I hope it holds all of you guys over! 