I think what I see most of in MMA is arm punching and/or punching off and transfering momentum to the backfoot a lot. With 4 oz gloves you don't need that huge follow through if you're on the button and you can't follow through a right hand in MMA like you do in boxing because, in boxing if your opponent slips the punch, you tie up or reposition yourself. In MMA, you're on your back.

Just my opinion.