Only feasible explanation for four captains to get their bankais stolen is perhaps to put more brains in how to break the seal or whatever. IE if Renji and Byakuya were to fail in figuring out how to break it maybe another team could figure it out and then mass communicate how to do it to everyone else.
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Courage is not the absence of fear. It is the knowledge of what to be and not to be afraid of.
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