Lifting weights and especially high numbers are completely irrelevant to MMA… actually, being good at chess would be more helpful than benching big weights… MMA is full of such examples… yes, some guys are decent fighters despite their nice big muscles, but they are decent just because they have developed skill and have inborn talent to fight, and not because they lift a lot… actually, very often guys have certain genetics and they look like they lift a lot when in fact for the most part it’s just the result of functional training and nutrition high in protein. Real fighters don’t care how much they lift if they lift at all… for example Fedor Emelianenko, for resistance exercises he basically did just body weight and similar exercises, and to be honest, his body by American standards looks awful… but all those impressive looking fighters who count on lifting big numbers have no chance against Emelianenko…
Lifting HEAVY weights confuses your punching motorics, you build the kind of muscles and strength that is very difficult or almost impossible to apply in fighting the opponent, it doesn’t help your wrestling either, it just allows you to stay on your legs stronger and stiffer, but without the quality for a quick unexpected maneuver to complement your skill. On the other hand if you lift seriously you have no way but just to seriously compromise your sparring, functional conditioning, and other more important aspects of training for MMA. Observation: punching is being affected by lifting heavy weights a lot, while low kicks don’t suffer almost at all! this is because a low kick is way simpler and more primitive movement than a punch.
When I finished my boxing career, I started lifting weights and liked it quite a bit , and I was trying to build some more functional muscles by also spending time hitting the bag, plyometrics etc… well, those just helped not to become like a real punching bag myself and fought against that stiffness and completely non functional muscle that comes with lifting heavy ass weights, although there wasn’t even thought about making progress in punching power. I don’t believe in heavy weights as lots of coaches don’t either.