The team members grow together. It is the team leader's responsibility to orchestrate the team's growth. He must make sure his people grow both personally and professionally. And he must ensure that their growth happens together - as a team. There is a team fit.
Individualism wins trophies, but teamwork wins pennants.
Each team member plays a special role. An effective team has a good bench. The team members know exactly where the team stands. The team members are willing to pay the price. Success comes down to sacrifice - willingness to pay the price.