Right, but I think a new development occurred in the second century which opened the door for Judaizing Christians to make inroads to Gentile Christians. That is the split between Gentile proto-orthodox and Gentile gnostics. For the first time Gentile christians opposed gentile christians.
In the second century some Gentile Christians likely turned to Judaizing Christians for advice in combating Paul’s followers, most especially, Marcion, who rejected the Old Testament. It is interesting that Justin’s defense of christianity around 150 CE never mentions Paul, the apostle. Was he considered tainted because his epistles were used by gnostic Christians? Possibly. Therefore, who better to advise the proto-orthodox in their battle with followers of Paul than the Judaizing Christians who opposed Paul for the last 70 years? The enemy of my enemy is my friend.
Anyways, the prto-orthodox probably listened to Judaizing Christians as long as it helped them against the other Gentile Christians, namely, Marcion, but later (180 CE) cut them loose when they no longer needed the Judaizing Christians.