One of the things that leaders have to think about is the development of the members of their team. It is an interesting challenge, and is a responsibility that comes with the role.
Hardly any world-class athletes, musicians or sports teams do not have a coach, yet we struggle to apply the same logic to other areas of our lives & careers. There is only so much you can do or accomplish on your own, and then there comes a time when you realise that to find those critical improvements you need someone to journey with you.