User blog comment:Godisme/San'ou/@comment-5336416-20120802232927/@comment-1179273-20120802234910

As far as I'm aware, no one is denying the fact that there are certain Captains who are stronger than some others, as this has been clearly established in Yamamato's case. However, saying that Yamamato is above captain-level isn't correct, as he himself is a captain and no rank/level exists above this within Soul Society. Basically, captain-level/class seems to be incredibly broad with no true upper limit, meaning that anyone who obtains the rank or has power equal to someone with it, is captain-level regardless of how comparatively weak or strong you believe them to be. Well, that's at least my take on the issue anyway.