What role is usually played ... is it that of administrator,? Anyone with leader skills, even a non-diver can play that role. Or is it that of mentor and educator?
Even if he/she was an old salty with 1000's of dives experience, when new members come on board, they're going to question things. Will they give the respect that is necessary for things to function smoothly? Yes, as long as there is a strong entourage of support for the "figure head". Support is plenty of active dive leaders for new folks to turn to for mentoring and trust. These supporters must completely back the leader and show manifest and overt loyalty. Otherwise replace the leader with someone who garners these qualities.