You're using the NBA as your basis when that's the one sport where genetic height is an inherent factor.
Most other sports aren't capped by this.
Maradona's parents weren't college athletes.
Ali's parents weren't Olympians.
It's work.
But we can disagree.
I'm using the NBA because it demonstrates the fact that at least half the time you come from the type of stock. It never said how tall these parents were and if their respective sports required height, we can assume they were tall but there are also cases of men hitting a recessive genetic lottery in height.
I do believe most humans are more athletic than we try to be, so all pros do not have to have some clan of pros and Olympians behind them, since everyone doesn't play a sport for various reasons, but I'm simply not going to agree to 90% work, least of all to be the best ever to do something physical.
There are people who will do all the reps in the world and cannot say they were ever top 50 in a sport.
I don't think X reps makes any man able to make shots in the manner in which they'd get defended with guys in their shirts in scrimmages at the pro level. You need a template for that, height is included.
I don't believe X reps makes any man able to get 3 punches in on Crawford, Mayweather, Pacquiao, Ali, in 36 minutes of action. Or have the reflexes to duck any 1 punch from them or a lesser fighter.
I don't believe X reps makes any man able to manipulate a ball with his foot through 11 men at full speed for 20 years while not straining or breaking something and still processing everything happening.
I don't believe X reps can make any man accurate and aware enough to dominate a football game with their shoulder and wrist joints, and peripheral vision and win 15 games against 200-350 pound men trying to crush you, well enough to win championships.
There's also late bloomers who clearly missed out on reps but still become HOF athletes in their sport. Why? Natural ability unlocked.
We'll have to agree to disagree. And I think we talked about this years ago. There's hard work but the best of the best, of the best of the best, tend to be rewarded by having a natural gift or set of gits others don't.