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Aizen's true intention was to see the process of 'Hollowfication' he referred to Shinji and the rest as "test subjects" and was going to kill them in the end but Urahara used the Hōgyoku to save them and stop the Hollowfication process turning them into Vizard rather than full hollow. They chose not to help Aizen because he intended to kill them from the start.

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