Then the apostles and elders, with the whole church, decided to choose some of their own men and send them to Antioch with Paul and Barnabas. They chose Judas (called Barsabbas) and Silas, men who were leaders among the believers.
(Acts 15:22)
Hence Judas called Barsabbas was a Jewish-Christian leader of the same importance of the Pillars. He was also a "prophet":
Judas and Silas, who themselves were prophets, said much to encourage and strengthen the believers.
(Acts 15:32)
When the name of Judas was defamed forever by "Mark" (by the infamous episode), the Judaizers had their revenge by casting Judas as Joseph, and putting him in the rehabilitated form of "Joseph" Barsabbas, so that the old (defamed) Judas was replaced by a new "Judas" (masked as Joseph):
So they nominated two men: Joseph called Barsabbas (also called Justus) and Matthias.
(Acts 1:23)
The implicit message was: even if one of the 12 was an evil Jew (as per gentile propaganda), he was not replaced by the gentile Paul, but by the his good alias.
Judaizers - Gentilizers: 2 - 1.
Note how this false "Joseph" but genuine "Judas" did the opposite thing of the old Judas Iscarioth:
Joseph, a Levite from Cyprus, whom the apostles called Barnabas (which means “son of encouragement”), sold a field he owned and brought the money and put it at the apostles’ feet.
(Acts 4:36-37)
A field was not bought for Judas, but a field was sold by Judas.
Now this has serious implications to interpret the Judas episode in the Gospels. The episode was invented against a specific Jewish-Christian, Judas Barsabbas who was really existed.
The first implication is that the founders of the cult were accused of having betrayed Jesus. Basically, the accusation of Marcion against the 12 apostles.
The second implication is that the rivarly is not a generic rivaly between Jews and Christians, but a sectarian rivalry between Jewish-Christians and Gentile Christians.
The third implication is the more suggestive:
The author conceded that the Judaizers founded the cult, since they delivered (in the person of Judas) Jesus to the gentiles. But in this recognition, he is seeing himself as totally distinct from the Judaizers. As a member of a new religion that is distinct from Judaism.