The Lord has given the five distinct ministry gifts of the apostle, prophet, evangelist, pastor and teacher to the Church. (Ephesians 4:11)
Each of these ministries has been given the charge and responsibility by the Lord to work together as a ministry team to help the saints become spiritually mature. They have also been given the divine grace and ability to teach, train and prepare the saints to do works of service for God, in whatever capacity that He has called each of them to serve Him. (Ephesians 4:12-13, I Corinthians 12:11,18)
There is nothing but stresses when we rely on one man or one woman. Imagine a house built only electricians or plumbers.