I hope this is just a joke right? The Gracie's are good, I'd even go as far as saying great. But they are no Bruce Lee. Bruce did have ground game, and if you read some of his books he does incorporate some take down defense and ground game. Bruce could hit you from six feet away in less than a fraction of a second. He would have had the Gracie's spinning like a top trying to find him. They had to slow down some of his films so that viewers could see and appreciate some of his mastery. That on top of his dedication to fighting as a whole, he was a complete martial artist by every sense of the words.... and his physical attributes were nothing short of astonishing. That being said, if a Gracie did happen to get him down and into a dominate position, they probably would have broken about 2 or 3 bones trying to do it. Therefore he would have had a advantage there also. Now with all that being said, we will never know for sure who would have won. We can only speculate and dream of such a match up.