McCallum took the best shots of one of Boxing's most devastating punchers , Julian The Hawk Jackson, and still won that 2 rd shootout. Julian Jackson was undefeated, 29-0 at the time, 27 KOs. Intimidating, gave off a sense of menace.

No way a prime 5'8" Floyd would beat a prime 5′ 11½″ Mike McCallum, nor even sign for that fight for that matter.

More ring-savvy than Floyd, more multi-dimensional than Floyd, more durable, iron-chinned, bigger, stronger, KO power, stamina. McCallum was a brilliant counter-puncher, and he wasn't the most avoided man in boxing for nothing. Guys at 154 and 160 avoided McCallum. Dude fought as high as Cruiser at the end, and he was never knocked out. Floyd with his brittle hands wouldn't be able to get McCallum's respect to keep McCallum off him. Guy schooled James Toney, for $#!t's sake! In that era, I think the one guy Hagler didn't fight was Mike McCallum.
Emanuel Steward prevented a bout between McCallum and Hearns because Steward knew Hearns was the cash-cow but wasn't going to be able to win that fight. Unfortunately, as good as McCallum was, he wasn't a big Draw at the gate.