One may surmise that they sent Barnabas, and not someone else, because he was a Cypriot by birth.
For this reason he could more quickly and easily than anyone else enter into close and sincere relations with the Antiochene preachers, some of whom were his fellow countrymen, Cypriots.
His personal qualities also certainly influenced this appointment. The historian says of him that he was a good man and full of the Holy Spirit and faith.
Moreover, the name Barnabas, "son of consolation" (Acts 4:36), given him by the Apostles, shows that he possessed a special gift of persuasiveness and consolation in speech.
By all these qualities, he was undoubtedly considered especially capable of understanding the situation in the Church of Antioch in its true light. He could also win the Christians there to his side and remove misunderstandings and disorders, if such appeared.
But when Barnabas came to Antioch, he observed no deficiencies there. On the contrary, he saw clear traces of the action of God's grace and rejoiced in his spirit.
Therefore he only exhorted everyone to cleave to the Lord with a sincere heart. His activity in Antioch served to increase still further the number of believers.