Board Thread:General Discussion/@comment-12301089-20131211070550/@comment-8986886-20131221210817

Sternritter M wrote: Byakuya was wrong, yes, but he didn't have much information on Ichigo at the time, so he didn't know.

Well, to be wrong about something is basically to put ones ignorance into words, something which Byakuya did alot in the SS arc. I believe Ichigo managed to crack Byakuya's usually solid composure, and his pride, along with his stubborn side, led to Byakuya underestimating Ichigo.