There were few lhw i would say that were pretty great at the weight class Spinks was in. Muhammad, Johnson and Qawi are about as good as any mw Hagler fought what Minter last guy forgot dudes name before Hagler lost to Leonard. Hearns was pretty good at the weight but was coming up and Duran was no star really at mw and up. If we count the Hearns win i say Spinks although both fights were pretty close beating Holmes was pretty huge and going up in weight to do it looking at the names i say lhw in Spinks era are as good as any really.