Hagler would have destroyed Spence, Hagler`s reach was 75 inches GGG`s is only 70 inches, Kovalev`s reach was only 72 inches, Hagler`s jab would have been too long and good for Canelo and he would constantly feinted with his jab just a better boxer.
Hearns had more power at middle than Canelo has and more reach than GGG and Canelo Hagler would have out-jabbed the pair of them, Mugabi was bigger and stronger than Canelo too.
Tale of the tape isn't very reliable. Hagler had decent reach but it wasn't anywhere close to being 75 inches. Hearns had a fragile mandible, and he had broken his hand in the first round itself. Prove it.
Hagler had a better jab than Jacobs and constantly feinted opponents plus he could go toe to toe with Canelo because he was a better inside fighter than Jacobs and a better counter puncher.
Amazing on this forum why you'd even have to explain to someone why Hagler is head and shoulders above Danny Jacobs who I doubt could beat Fulgencio Obelmejias
the hair follicle test did not clear him of anything Dude got caught juicing twice... the hair follicle test does not work on lighter colored hair I.E like red hair so it was just a PR stunt.