Norris had served in military and had some boxing too so it isn't easy to tell that he was fake ....according to wikipedia, chuck norris is a black belt under the machados. Bruce lee have zero belts and still choked the sucker out. Chuck norris is a fake martial artist, like a marc laimon or greg jackson
He had learned some Tang So Do and had competed under some Karate etc rules a bit ....
About BJJ.... I didn't knew that he does have some belts.
If about older time artists look on Ivan Gene Le Bell. Judo....