I think when most people think of athletic leadership, they think of a Jordan-type: the best player who will get in the face of his teammates and demand a certain level of performance.
But there are many types of leaders and trying to fit that mold when you are not that type of player is where many stars have problems. Kobe, for example.
Just because you are the best player does not mean you are the best leader. It is probably best for many stars to become "role players" in the leadership category if it doesn't suit them and let someone like Grant Hill or Avery Johnson help lead the team.
It was neat to see the Celtics last year (and this year) have multiple leaders. Ray Allen is not the in your face outspoken leader on the court, but his commitment to practice and preparation are unequaled and he is great lead by example guy for anyone who wants to put in the work, like Rondo. KG is more of the yell at your face leader, which can work to pump a team up, but can be tiresome over a season, I bet. Pierce is more of the in-game leader who can carry the team on his back for stretches but also shows the value of not having to take every shot. It all combines with a matching coaching philosophy to form a very effective leadership. Banner 17 would still be a far off dream if any of those three tried to be Jordan like Kobe, Lebron, etc. do.