Nunn (Kalambay aside) isn't a huge puncher, therefore, Terry's weakness (chin) will not be exploited, enabling him to win a unanimous decision
Norris could out box Nunn and would if he was focused, but either fighter sometimes forgot their boxing abliity and walked in punching. That fighter would lose.
Norris could outbox him based on WHAT exactly? Norris wouldnt even fight a single dangerous Junior Middleweight during his career (not after Julian Jackson knocked the daylights out of him) Nunn was a real good MIDDLEWEIGHT He'd never get in the fucking ring with him, much less outbox him