Ministry as depicted in the New Testament was never a one-man show. That does not preclude the role of a dominant leader on each team. Within the framework of plurality, there will invariably be those who have more influence. The diversity of our gifts (1 Corinthians 12:4) means all people are differently equipped. Therefore a plurality of leaders does not necessitate an absolute equality in every function. In even the most godly group of leaders, some will naturally be more influential than others. Some will have teaching gifts that outshine the rest. Others will be more gifted as administrators. Each can fulfill a different role, and there is no need to try to enforce absolute equality of function.