You're right, I should have included wrestling. Some of the habits wrestling instills don't work in a fight (like going to your stomach instead of your back), but overall it's an enormous advantage. The speed at which a good wrestler learns BJJ or MMA is startling.
Hint: if you're doing BJJ and you go against a wrestler (a number of guys here are former wrestlers) start on the ground. You basically will not get the take down. On the other hand, once both of you are on the ground, its a fair fight ;)
I've rolled with many wrestlers - including Division I wrestlers and those who were competitive at the state level. In my experience, their advantages are mental toughness, grappling strength and a relentless top game.
