Just as much as Michael Voss. None. But as a captain, and his thoughts on the game, when injured, he coached with Malthouse helping out the youngsters in the understanding of the game plan(s).
Nearly 300 games worth of experience, thats what he's got, and he's just out of the game.
You don't need a hell of alot of experience to be an "assistant coach" anyway. Just ask Josh Mahoney.
No need to be naive.