A:I'll watch the next episode before answering this, might contain spoilers.
A: I believe Urahara had made some research into Vizards before Aizen started experimenting, and if that's not the case, Urahara was the only one around to blame...absolute power must make absolute decisions, I'm really glad Aizen killed them all.
A:No,cero is a different type of attack, when Shinji used cero, it had the same name.
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