i want to throw two concepts:
leader vs player
is an elite player necessarily a good leader?
i believe a good player and a good leader require different qualities. an elite player is not necessarily a good leader. There is one elite player with uber toons in my guild who doesn't like to lead (although, when he is leading, he does it well). A good leader needs to know quests very well, know about different classes and the party members, know about and able to determine suitable strategies and tactics, able to communicate and gain the trust from the party, and ultimately lead the party to win. A good player does not need that any leadership quality. He only need to do his role exceptionally.
player vs toon
when a elite player is control a gimp'd toon (say, logged in a friend's account), is he still an elite player?
i believe an elite player can fully utilize the potential of any toon. He knows the game mechanism and quests very well, and have experience in different situations, so he knows what to do in what situation. A good toon only need to have a sensible build and good gears.