User blog comment:SilverRain/Ichigo's True Strength/@comment-11598552-20130706080157/@comment-10961564-20130725193535

that ain't clear..it was just said that the hogyoku rejected him and Urahara sealed him.....i guess its not coz it can fulfil his desire of getting free(if he has one) and the Gotei 13 would not imprison someone with such a thing....but let's see, maybe i am wrong as we don't know the complete nature of Urahara's seal(maybe its preventing the hogyoku to manifest Aizen's desires, in case its still attached to Aizen)