Eventually, even if they continue to play more than one sport, they'll be able to choose just one as their favorite. I believe that someone who really wants or needs structure and discipline in his life will gravitate towards a coach-oriented sport like baseball or football where there are lots of restarts and the start of each play basically looks the same. They are constantly listening to commands about how things are to be done. The coach has tremendous influence. Everything is very structured.
Basketball is similar, but there is a little more free flow to the game.
And at the far end of the spectrum are the soccer players. Soccer is about the least structured sport I can think of. Once the game begins, the coach has very little say in what happens. It's a player's game. It's more chaotic, and because the 'picture' is always changing, it is necessary for players to constantly make decisions on their own.