Well, I like hard proof. Just like how I'm discussing the rumored Atlas-Camacho scuffle in another thread. I won't say it didn't happen, won't say it did. However, both were so popular and both inspired so much deep emotion that I couldn't imagine any observers being quiet about it. So, sure, it could have happened.
Bruce Lee just had a book put out on his real life scuffles, no doubt that will not satisfy his doubters and maybe it shouldn't but it is interesting. I know Bruce was bad but you know, even with the greatest fistfighters, someone will say they weren't that good. Why does that matter? Well, even the hardest proof possible, the footage and the records don't settle or prove anything to the hardheaded. There will always be people who say Ali, or Duran or Robinson weren't that good, always. So, even with proof, some people aren't satisfied, but I'd like it personally.