User blog comment:Godisme/The Fire3/@comment-5408536-20120912160549

I hate to tell everyone but Yamamoto never uses bankai in the show. The flame around him, the flame that is put over aizen, flame used to kill the hibrid beast, and the big pillars of flames you see him use when he fights Aizen is only his shikai. He is one of the few characters that never use their bankai in the show. Along with Isshin, Udahara, Yoruichi, Shinji, Aizen, Shunsui, Zaraki, Yumichika, Yachiru, Tessai, Love, Lisa, Mashiro, Hiyori, Chōjirō, Ōmaeda, Rōjūrō, Kira, Isane, Momo, Tetsuzaemon, Nanao, Hisagi, Rangiku, Nemu, Rukia, and Kaien. That is all the captains and lieutenants that you never see bankais. All the realeses you see from these soul reapers are only their shikai.