Those men were chosen to serve tables and see to the distribution of food. They were not commissioned to be evangelists or preachers but to free up those who WERE evangelists or preachers.
Acts 6 1 Now in these days when the disciples were increasing in number, a complaint by the Hellenists arose against the Hebrews because their widows were being neglected in the daily distribution. 2 And the twelve summoned the full number of the disciples and said, “It is not right that we should give up preaching the word of God to serve tables.
3 Therefore, brothers, pick out from among you seven men of good repute, full of the Spirit and of wisdom, whom we will appoint to this duty. 4 But we will devote ourselves to prayer and to the ministry of the word.” 5 And what they said pleased the whole gathering, and they chose Stephen, a man full of faith and of the Holy Spirit, and Philip, and Prochorus, and Nicanor, and Timon, and Parmenas, and Nicolaus, a proselyte of Antioch. 6 These they set before the apostles, and they prayed and laid their hands on them.
You are soooo right.