Chris Byrd was a very good heavyweight, underrated by many people. Easily overlooked, but he was a good fighter. I think he is pretty much on par with the lighter weight guys you listed. Dokes probably was a better puncher, but Byrd was a very good fighter. Eddie Chambers is another guy whom is easy to overlook as is Calvin Brock, but Wlad literally beat them out of the division, and in Brock's case out of boxing altogether.