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I think because Aizen's original goal is to kill the the Royal Guard and zero squad, Bach will likely be beaten by Ichigo and then Aizen will show up and become the true villain. All of this from 1000 years ago to now was all part of his plan and he will tell the defeated Bach that. And then the story will move along with the zero squad and what happened with Urahara. Most likely one of Aizen's minions whos gone into hiding waiting for Aizen to be released which he planned. TROLOLOLOL.
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