Board Thread:General Discussion/@comment-24251492-20131204155955/@comment-2120712-20131204200221

His founding of the Shinigami Research and Development Institute is quite significant and beneficial. And its suggested that he may have invented the gigai. I just think Aizen's intereference kept him from being fully reconginized. I think he is too used to living in the world of the living to join the RG anyway.