User blog comment:Captain Brooks/My thoughts on Aizen sama./@comment-1740937-20100526193735

Toney B; him saying he has reached the limit of his Shinigami self further backs up the claim that he hasn't got Bankai. As he fought Isshin, he never released Bankai. Now, if we were to say "I'm at my limit at this moment in time" then it would insinuate that he had a Bankai. However, giving the fact that he hasn't released his Bankai at all, it kinda suggests he seriously is at his limit.

Well, the only real flaw is that the opponent has to see his Zanpaktou; which isn't a flaw at all really due to the fact that he isn't going to say "I'm about to release my flawless Shikai. Oh yeah, by the way, if you look at it you lose".

Well, in the Vizards defence, they have become more human by continued use of the untraceable gigai. But, that is a slight defence. Doesn't make up for their negatives.

Yes, the Lieutenants could've achieved Bankai, but not Hachi. He hates engaging in swordplay; as such would be much more powerful with his Kido. Just a side note; in the Bleach manga, we see Hachi unveal his Zanpaktou, but not actually use it. I mean...what's the point of that?