Sports like mixed martial arts are really difficult to decide on.
Like someone who's 240lbs and a fighter is going to do damage and if he's actually good at grappling or striking he's going to dominate.
Only problem is that he can't really have that many fights because fighting at that size is just too costly.
It almost seems like if you want to do martial arts at a high level you have to make sure the martial artists stay lighter than 140lbs.
At that weight they are going to be able to fight more without getting as serious injuries so they would be able to learn and teach more about hand to hand combat.
It would just be weird to have this very masculine sport where the people who are the "thoughest fighters" would also be ruined in a fight in real life by anyone with the slightest understanding of combat at 200lbs+.
That's probably why martial arts is such an asian kind of sport. Even in adulthood they stay at that level where you can have really instructive fights.

That's frankly what the sport is anyway.