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I knew he was a monster
This is how a true leader should be
Okay, I guess
Meh...I have seen more powerful characters
There is also the issue of the medallion (it's possible he hasn't used it because he wants to fight Yama at full power but might change his mind) and enslavement. Ichigo stopped Opie's enslavement by smashing his halo in a sneak attack. I doubt Bach would let yama take him by surprise like that.