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These are all learned skills and as I've been saying, if Russell Westbrook has been running around the neighborhood as a kid with a soccer ball he could've easily learned this.
If Ronaldo has grown up in the US with the athletic ability he has and the weight training/conditioning training we have here, he could have been a slow receiver maybe (he is like 6'2) and the slightly racist side of me says that since he's latino he could've been a really good shortstop with his agility and strength or a centerfielder
Well that's also the other issue with player development in this country. The majority of our youth go into the NCAA system while their agemates across the pond are playing professionally in academies. That's where the most important growth happens and our kids just stagnant in the ncaa's system.
Obviously most of these sports require the right genetics and your point is probably true for the most part. But I've always felt sports like baseball, soccer, golf require so much natural talent that even the bear training could only take certain people but so far. A Russell Westbrook is probably much more likely to find success in the NFL than the MLB assuming equallvalent training during his childhood imo.