Probably most people in the world can't be taught to throw a 100 mile an hour fastball or even 80. And there are plenty of minor league ball players that have dedicated their hearts and souls into getting into the majors but never do. And there are plenty that can't even make it into the farm system. It's nice to think that sheer will gives everybody the same chance. But the truth is that there's a lot of physiological variation between people. You wouldn't say that everybody in the major league is number one but they all have the ability to outperform most of the world in that sport.
Body and mind. Apples and oranges. Sorry, but you really can't compare the two. You can't learn to be 6' tall -- believe me, I've tried! In any case, physical ability doesn't necessarily translate into success, so the point is moot.
As Hillsilly correctly pointed out, not everyone has the will power/drive/desire to get up early in the AM and do what it takes to become the best. That is what separates the best from everyone else.