Who wins? I'd pick Norris by late TKO. Nando always had trouble with speed, and Norris had speed coming out the ass... AND he could punch to boot. Norris TKO 10 in a very good fight.
I'd lean towards Terry, but only if he fights to the top of his game. Even so, his chin could give way at any moment.
I consider Vargas a more dangerous offensive fighter than Brown..A repeat of Brown-Norris I is not unlikely. But overall Terry is just better...I think he could stop Fernando, especially later on..But I think he would be better off not chasing the stoppage to hard in case he gets buzzed in the process. Norris UD happens more often then not....either man stopping each other is always a serious chance.