Tyson would have killed Gracie. BJJ only works if you opponent is of equal size, strengthism or if your opponent is bigger, slower, weaker,and doesn't know any BJJ. BJJ does not work if your opponent is bigger, stronger, and more athletic than you period. Even if he doesn't know any BJJ he will still beat you. Tyson was bigger, stronger, and more atheltic than Gracie ever was. Tyson would have muscled out of subs and beat his ass.