User blog comment:Captain Brooks/My thoughts on Aizen sama./@comment-1706259-20100329215659

Kubo has been known to change his mind as you said (thinking about the Ichigo not having much to do in the zanpakuto unknown tales arc; which was obviously not a followed through statement; even if he wasn't directly involved.)

Overpowered= not getting injured at all, not being surprised, angered etc. IMO.