A good football coach doesn't have to be great at playing the style that they coach their players for. Having worked with her before, Dava is a great leader and manager - which is I think what's needed for a position like this.
Depending on what you do, you might have a natural gift or be a good learner for management skills—but you also may not. If you're not and shoehorned into it for tenure (or whatever other reason), both you and your students suffer.