Strange that the Mountain was so averse to doing pro wrestling...
...when guys like Ali, Chuck Wepner, Leon Spinks, Tyson, Holyfield, and Floyd Mayweather all took part in exhibitions/events with wrestlers. IIRC, Ali was also a bit of a wrestling fan and a staunch admirer of guys like Gorgeous George. I also remember reading somewhere that Primo Carnera turned to wrestling after retiring broke from boxing and ended up headlining wrestling shows for the next 15 years(he was one of pro wrestling's biggest box office attractions during this period).
I can understand Mountain's resentment for the sport AFTER his manager intoxicated him into missing out on the camp counseling gig. Makes sense that he'd hate the wrestling job, at that point, since he was forced into it by a person he thought had his best interests at heart. But he was dead-set against wrestling from the beginning, even when he had no options. Yeah, sure, pride is important but that didn't seem to hinder the boxers I mentioned aboves(guys who rank among the best in the sport).
Still, a fantastic film and probably my favorite boxing movie besides the original Rocky.