One thing seems to be holding steady in the world of sports and well the world in general, those who practice harder and deeper for longer know more and win more than those who don't. Finding a situation where an elite athlete did NOT put in more time and more focus and go to extraordinary lengths in training is extremely rare.
There are many sports where this is not only unnecessary, it is outright impossible.
My nephew Brian's son was a pretty hot pitcher when he was 8. At that age, the most hard throws you are supposed to make is about 100/week. Sure, he played catch a lot with his dad, but serious, dedicated practice time actually throwing fastballs - next to nothing compared to any pool player.
He's 14 now and is still going strong. Time will tell. He has all the desire, the eye, the heart, the knowledge that you might expect of a kid his age who desperately wants to pitch in the majors, but I personally think he will be too small by the time he is finished growing. His mom is a tiny thing and Brian is only about 5' 9" and weighs maybe 180. Damn genetics. May rob the kid of his dream.