I recently watched McCallum vs Graham again I scored it a draw based on that and the fact McCallum got schooled by Kalambay the 1st time I think Nunn is a bad style match up for him and wins a decision. If this fight was 15 rounds then maybe McCallum would have a chance of breaking Nunn down and stopping him late but over 12 I don't think so.
True, Nunn is a pain in the azz for everyone. Toney had to thank God he was powerful and slick to catch that flying chin of Nunn,not so sure for McCallum though.