Paul was well into missionary travels when he corrected Peter, and the Gospel was well into INdia by the time the eleven were killed. John on the Island of Patmos was the last, many years after the Gospel had reached Spain and even what became the British Isles.
Yep now so you can understand what I am saying where was Paul at when Stephen was stoned? A very young Paul held the garments of Stephens killers. It all didn’t happen overnight is my point. What you are describing took place between those two times. Paul was in exile among believers for some believe as long as a decade after his conversion. In the mean time they all had their personal struggles and learning experiences.