15 rounds at welter. Who and why? The finesse and boxing ability of Williams against possibly, one the most adaptable prizefighters to step into a ring, Emile Griffith.
This one would be a classic. I'll pick Griffith to hurt Williams and pick up a squeky decision, but it's pretty close to 50/50.
Williams' best weight was middleweight. I really think this depends what weight the fight was at. Middle or welter. Maybe Griffith would just be too fast for him , but Holman was a very good boxer, and strong. It depends which weight though.
I see Williams winning a decision in a very close fight he was too slick don't feel that Emile physical strength would be too much of a problem as he was used to fighting stronger guys. Williams 9-6.