The key insight is that in leadership, issues generally stem internally rather than with the people being led. It is emphasized that every leadership challenge points back to the leader - not coaching enough, lacking attention, failing to challenge, and inhibiting development are leadership shortcomings. It is crucial to recognize the responsibility of leaders in addressing and developing their team members. Furthermore, fostering humility in leaders can be achieved by assigning them the task of training others at their skill level, which requires them to elevate someone else's abilities. True leadership is highlighted as the capability to create new leaders, demonstrating that the essence of leadership lies in serving others and enabling them to reach their fullest potential.