Well, he had athleticism and was always willing to learn in his prime.
But if you are playing with the thought (how would he do in today's MMA), he would have had to be around 30 years now and being born 1980 instead.
If he was born 1980, who knew how his upbringing would have been, he would probably not have been the same dude at all.
He was a bit ahead of his time though, showing people in US something they've never seen before, and also willing to combine and use things from different arts, which was a new thing back then.