Recommended Reading
Although, just once, for variety, I would like to see Yamamoto NOT be the next incarnation of Dumbledore-the-Oblivious or "Good god the man is fucking crazy and he's got a sword!".
Alright, so the man was hoodwinked well and proper during Aizen's little game... fair 'nuff; everyone did, though. He seems to prize "the justice of the world" above "an individual's justice", fine.
Look at his two favorite (still 'living') students though; they're some pretty laid-back guys and they respect him intensely, so there's got to be more to him than that...