"Bruce Lee's movie fighting style" then, which has little to do with his proper fight training, like Jean Claude van Damme's fight choreography has little to do with his fighting background.

Apart from that, I do take issue with the for some reason increasingly popular notion of Bruce Lee's fighthing being some sort of proto-MMA. MMA is not just taking something from various sources and calling it "<first name>-fu" or "<first name> tang doo". The essence of (old school) MMA/Vale Tudo is about finding out what works and what doesn't through literal trial by combat, it's not about the mix and match aspect.