He clean KO'd 13 other guys apart from Coetzee, and stopped 23 besides those. As to who they were, mostly 2nd, or 3rd tear fighters, much like everyone else gets fed to pad their records. I think you'll find of the 14 guys he did clean KO, they had only suffered the same fate prior to facing Bruno, less than a dozen times BETWEEN them. That would indicate he could punch.