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It wasn't really explained but it is true that Gin took off most of Aizen's torso with his attack.

Aizen is not a Vizard, Aizen stated that he still controls the Hogyoku despite it being outside of he`s body. Kind og like gravity, you jump up, not touching the Earth, but Earth`s gravity still affects you. So Aizen was still linked with the Hogyoku, just not physically.

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