the fact that Mayweather is boxer doesn't mean he's completely square and cant do anything else except boxing (i also not saying that he can, i dont know him personally) i think that if let's say he starts training Muay Thai then he will start just like anybody else + he already knows the boxing part (which is pretty much most important), he ofcourse will have to spend shit loads of time training - which is easily possible since he doesnt need to go to work every day and has all the money for trainers and whatnot plus IF he has natural talent (he probably does) he will learn it much much faster than any of us. probably he wont do so good in grapling BUT i say it again we dont know the guy, some people have nutural abilities, im sure that many of you have a friend or just know the guy who never did any wrestling but still gives you a good challenge even though you did train it. or the new guy that comes to your MT class and kicks/punches almost like you do ? do you think this kind of guy will lose this talent/ability if he becomes professional at something ? maybe Mayweather is that guy ?
I say he should stop talking about it and start training.
NO way will he do well.
Mayweather has tuned his reflexes and habits to make him successful at BOXING.
You simply cannot UNLEARN that behavior. Those habits will get him KTFO in MMA.
To achieve the level of boxing skill he has took him a hellofa long time, its pretty much ingrained on him now and he fights primarily on instinct.
He will never ever ever make a good transition.
He would have to put on weight on his legs, which would bump up his weight class. He would have to strengthen his torso and hips hella alot more to work on stability.
Mayweather slips and slides, he throws punches from angles and knows when to 'turn his back' on his opponent or clench to get out of trouble.
This is really good for boxing, but it will lay him out FLAT in MMA.