Maybe I'm wrong but I always thought a captain should be the one moving the ball with clarity and intent when no one else can, hitting targets when no one else can. Showing the way through congestion and extending confidence to those around them. The defensive things come second (from a captain's perspective) because it's much harder to lead by example in that respect. I know that as a supporter at least I notice the greatly beneficial things that Higgo does with the ball more than I ever notice him not running hard enough.