At first, this might seem like a strange attitude for a manager to adopt. But think about your own experience with role models, or someone you respect.
Just like we cheer on our children when they beat us at a game, one of the best things we can do for our employees is to help them surpass us. Managers benefit when they coach staff to develop their skills. Unfortunately, many managers are afraid of losing their jobs, or authority, and cannot make the change.