Depends on what trunks Foreman wears. If its those 20 year old ones from Zaire I don't think he could beat Oliver McCall. The Atomic Bull would be wearing some snazzy Modern trunks. McCall wins by out Moderning Foreman..too modern, too advanced, lifts weights, snazzy trunks.
Bruno had a better chin and was 10x more modern than Foreman. Look at the guys muscles. Hes beautiful, thats what wins fights.
TKO McCall would be a rough matchup even for 70s George. I wouldn’t count on George to win the first 12 round decision of his entire career against McCall.
I think Foreman of 1994-95 could have squeaked out a decision over McCall. Oliver wasn’t the boxer that Holyfield or Moorer was and his power was over rated. Also his focus and lifestyle were beginning to falter by the Holmes fight and that decision could have gone the other way.
Were Morrison and Brigg’s punching power ever in question though? Absolutely not and neither could hurt Foreman at all (even though you imagined Briggs “shaking up” Foreman, it never happened). Those guys were all chinny (LOL at Seldon being some sort of evidence of anyone’s punching power) and the Lewis shot was likely a fluke against a sloppy poorly coached LL. McCall was a decent puncher, with a low work rate, poor IQ (unless he had Manny Steward telling him how to actually fight) and is no chance of hurting let alone stopping Foreman. He was a fringe contender at best who caught lightening in a bottle once in his career. He’s a footnote. Alex Stewart hit harder than McCall, likely fluked damaging Foreman like that but still didn’t, floor, stop or even wobble George and neither would that also ran.
McCall had a sparring partner's mentality. He couldn't stop Frank Bruno. I don't see him as a threat to stop Foreman. Most likely scenario is Foreman's jab totally controls the fight with occasional rushes from McCall followed by a meltdown.