These guys may have fought, but where is the evidence that they were able to do what (the internal mechanics) what they trained in their fighting? How do you know it didn't go out the window just as it does with every single other IMAist we've seen. Saying they fought isn't evidence that they could make their "internal mechanics" work. Is there any footage of them fighting and making those mechanics work?
The other aspect of this is that of all the millions of IMAists in the world, you can only ever name two (and I don't think Oyama really applies as a IMAist). Let's say for the sake of argument -- and I don't believe this for a minute-- that out of millions a lucky one or two can develop this ability. Well, how useful is that for everyone else? Training that only works rarely or for a select few isn't particularly good training. Why spend your entire life chasing winning the lottery? Especially when you can train like they do in MT, boxing, judo, BJJ, sambo, etc. -- the functional martial arts -- and REGULARLY and CONSISTENTLY produce good results.