OK As the resident JKD guy I have to put my two cents in. First off, it would never happen. BJ couldnt make weight as Bruce would be fighting at 145. Secondly, Bruce wouldnt just jump into MMA. He'd be a fan first. After seeing a few of the top guys fight, Bruce would not get involved until he felt comfortable with his ground game. He'd be at legends training with Eddie, at least until he gets a purple, and then he'd go pro. If BJ could make 145, it would be Bruce all day.