Obviously using any crossover examples is not going to tell you anything one way or another. Of course someone who trains their whole life for one sport and then once well past their physical peak decides to give another a shot isn't going to be dominant, that's just redundant to say. I would HOPE that the arguement you are trying to respond to is that if one athlete had focused entirely one another sport from the get go, INSTEAD of their chosen sport, they could be better than so and so, which in the case of boxing obviously holds very little weight either. The point I was making is that Lebron James, for instance, is a FAR FAR FAR better pure athlete than either of the Klitshckos, but that doesn't take intangibles associated with the sport into account obviously. All combat sports are very specific in that sense, I know a couple of guys who were half decent martial artists from a young age who were absolutely useless when it came to so much as catching or throwing a ball etc, but they would beat the hell out of guys who were very multi talented in team sports etc. Just a dumb arguement really.