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That assumes that Aizen wants to defeat/kill Ichigo. So far, Aizen has pointedly missed opportunities to finish Ichigo off. He appears to have some other plans for Ichigo, which will no doubt be made clear in due course.

In short, yes Aizen could have finished Ichigo off sometime ago but then we wouldn't have much of a story.And because Aizen is one heck of a guy who wants to play with his dolls, he would want Ichigo to "stick around" and watch everyone die and soul society fall, THEN kill him.

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