It's got to be either Efren Reyes or Ronnie O'Sullivan.
Efren is the best pool player of all time, plays world-class/near world-class carom, and plays snooker at a high amateur-level standard. His best years according to him was when he was in his 20s, and that means he was already past his prime when he came to the US in the 1980s. The fact that he can still hang with the best players in the world today in his 60s says a lot. With the sheer amount of table knowledge and creativity he possesses, he will still be able to wipe the floor with shortstops well into his 70s.
And then you have Ronnie O'Sullivan. Made his first century break at 10; his first 147 at 15. Youngest ever ranking event winner at 17 years old. Holds the all-time record of 877 competitive century breaks as well as most competitive 147 breaks (13). His most notable achievement to me is his 147 break during the 1997 World Championships which he completed at 5 minutes and 20 seconds, a record no one will be able to break. He plays so fast because his position play is so good that he almost always ends up with easy shots.
What exactly are these two naturally talented at? Quite simply, Efren and Ronnie are the best when it comes to cueing through the ball consistently. Not only can they shoot very straight, but they can also get a lot of reaction from the cue ball with very minimal effort. Not only that, their table knowledge is unparalleled. Efren has the best pool brain and Ronnie has the best snooker brain.