Who wins and how? This would essentially be what Lomachenko did - fight a guy two or three weight classes above him and not get any credit (size matters) . In fact it wouldn't be just like that as Lopez is probably a natural light welter / welter himself and Spence is a weight draining 154lber
If Lopez stopped Ugas and got a points win over Danny Garcia coming into the fight like Loma had at LW then sure he'd be a credible threat.
We’d need to see Lopez in his early 30’s, and then operating a couple of weight classes above where he should be, taking on the young guns. Loma doesn’t get enough credit for that, and many just concentrate on the loss without context.
I agree dominates and dismantled him. There was a reason an excellent tough fighter like Mikey Garcia went into survival mode against EJ.