High school coaches can force players into positions or bench them. Unless you family is willing to move, your stuck. It is not the same with college players. College players can go to wherever they want and they can transfer if they want. So, coaches in college have to allow players to select their position. If the player insists on selecting the wrong position they get buried on the depth chart.
Last season Kongbo did not want to play tackle and wanted to play defense of end. Playing some DE got him on the field sooner. He was behind Derek Barnett.
If you have played sports you know there is a unique story to each player. Some have great careers and some don't reach their potential. It is like a jig saw puzzle the right player, in the right system, playing the right position with the right work ethic .., thrives. You may have a super star athlete that can't remember his name that sits the bench because he makes the same mistakes over and over.