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Bankai Ichigo + New Hollow Mask after Ulquiorra should scale to Crystalized Aizen. He was able to sense Aizen's reiatsu and that's why he didn't want to fight Aizen and Isshin headbutted him. Isshin previously mentioned he couldn't sense him. At least he scales to Crystalized Aizen. Ichigo was also holding back once he felt the heavy Reiatsu of his own hollow mask. Aizen told him that he shouldn't had held back.