They are not. The mission is always controlled by God. It is the followers' association with that mission that causes the powers and principalities of the world to submit. It is the Word of God that is efficacious, and not the bearers of that Word. T he point in today's Gospel is that every disciple of Jesus is also an apostle for Jesus.
Every learner is also a teacher.
Every citizen of the Kingdom of God is also an emissary. That means the mission of God in history rests on the shoulders of every Christian, not just those who are professionally trained, called, and ordained. Some Christians understand this and put it into practice. Many do not. O ccasionally people will tell me how much they admire the Mormons and Jehovah's Witnesses, because these groups are so active in sending out their own members door to door to bear witness to their faith.