You seem to have grasped the concept of my post quite well as you paraphrase it here in your comment.
Everyone knows their role and is able to carry out their respective roles to achieve goals.
I disagree with this as people who may be new to a role do not always know their role. It's in cases like this where the leader, and the team around the leader, need to be strong, helpful and understanding. It builds a platform from which a new member may begin to learn his or her role.
Finally, a successful leader is a leader who is able to give birth to new leaders from the people he leads.
I agree with this in principle, however not everyone can be leaders and leaders need followers. Everyone needs to be empowered though and I think maybe this is what you mean? I believe followers, those who operate under direction of a leader need to understand how they fit into the whole picture, how valuable their input is to the team, and it's the leaders responsibility to make that happen.
I completely agree with what you said, it's true that new team members need adjustment to take on the responsibilities of their roles.