Probably wouldn’t be an entertaining fight, but highly technical, and the question has to be asked at some point, he looks unbeatable. Who wins this matchup?
Whitaker easily. What I saw from the Stevenson vs Lopez fight was both fighters posing for 12 rds. Both men thinking of what to do instead of instinctively doing. Both men generally fighting from the same distance, and at the same pace. Both men in generally jumping out the way of punches instead of staying in the pocket, slipping, or parrying the punch and countering. (Note: Parrying is different than blocking) No consistent body punching from either man, that was done only as an afterthought... What is considered world class boxing in today's era would've been considered amateur night in some era's. Whitaker would embarrass Stevenson prime vs prime.
He would absolutely dominate him. The jab is too quick, he's too slick in the pocket, underrated body puncher, quicker of body and thought - work rate is another level. There's levels and Stevenson is a fair few below Pete.
Shakur sure AF aint beating Pernell at 135. I dont think anybody besides Duran beats Pernell at 135. History might show that Whitaker vs Shakur would be competitive at 140.