Most of it actually. Look up Gene Lebelle... he was a Judo guy who took a lot of challenge matches with different arts, and handled them quite well... including guys who could punch. While I am not a fan of Ronda Rousy, she went 12 and 0 in MMA, lots of fights in the UFC against gals that could punch. They eventually got her... but at the higher levels of MMA, they are going to give anyone problems. Also Karo Parisyan did well as a Judo player in MMA. I know Royce Gracie is bjj, but he won 3 of the first 4 tournaments (these tournaments took place in one night) and then went 30 minutes with Ken Shamrock, before he took a significant punch to the face. I remember the commentator saying "Now we will see if Royce can take a punch." Judo done well, does not give you much time to punch. Your first punch better be good against a Judo player, because you might not get another chance... and his throw is good.