Lol no they wouldn't... In fact it's fairly well known that GGG put Kovalev on his ass and had his way with him in sparring as confirmed by John David Jackson at the time.
Firstly.... I'm a fan of Hagler. Absolutely machine. So not to **** on your parade but Hagler never moved above 160 and his most acclaimed wins came against fighters coming up in weight....... Leonard, Hearns, Duran, Mugabi
Although when his troll shift ends his buddy troll iSAL just about keeps his average , albeit iSAL posts with higher IQ... I heard when 22's Lover is humping him, his face is buried in a pillow he's biting has The G man on hit...
Such a shame we never saw GGG truly tested while in his prime. It gives us more to talk about I suppose and there's a lot to be said for bossing your weight but would've been so much better if he had moved up or had at least a couple of fights with the bigger guys at catch-weights