User blog comment:Nick D Wolfwood/Questions questions questions!! Kurosakigate.../@comment-44061-20100625115723

No im not implying that. Im saying that everyone learns their zanpakuto techniques from their zanpakuto spirit. Ichigo happens to have the same technique as his father.

Also lets make this a point Aizen does in fact say after Urahara uses his seal. That if he was anyone other than himself after subjugating the hogyoku then the battle would have most likely been over.