Originally Posted by Myth
Bach is a full quicny he wasn't a shinigami ever. As for bach killing yama with his own power you're right i meant to say he took yamas power away first before doing so cause he knew what was up if he left yama with hos power.
Not saying he was but imagine if back then Bach was to Yama, what Uryuu is to Ichigo. They were allies from the conversation at one point, especially when you add what Mayuri said.