If Isshin was just a normal shinigami and was around when Aizen was making sure all of the upper echelons had seen his shikai, how was Isshin able to fight on par with (and at times surpass) Aizen in Fake Karakura? If he'd been training, that might make more sense, but he'd not been using his powers for at least the last 16 years - even if Aizen decided not to use his hypnosis, the power differential should have been such that Isshin would be on the ground with the rest of Aizen's victims
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