obviously both play a distinct role for athletes, and more specifically basketballers. generally speaking, skill can be taught so long as there is desire, effort, and willingnes to work. however, the ability in a game is predominantly nature. As much as training can influence your body, if you have more fast twitch in fibres in your body then slow twitch, then your going to be more agile and quicker then someone who may train more and have predominant ST.
looking at big name NBA players i.e. Lebron. He is a great player, has great skill and talent, especially being so young. But you have to ask...if he 30 4o kg lighter..and couldnt jump as high, thereby reducing his ability to execute..would he be as great??
obviously things such as his maturity of play, is something that has a lot of impact by nature because he is relatively inexperienced by comparison