To be a leader you must have followers. Carefully watch who real follows whom. Carefully watch the dynamics of a squad.
The athlete who screams the most often and the loudest is often identified as the leader. Why? Because he or she is voluble and calling attention to themselves? If you observe closely the real leader is the one who says little, but when they speak everyone listens. They are there in victory and defeat with a pat on the back and an appropriate word or phrase. This is the authentic leader because they are focused on the team not on standing out and calling attention to themselves. Their presence and example inspire their teammates to follow.