Cephas, the later leader of Peter’s church, is not identical with Simon Peter. It was Cephas, not Peter,
who attended the Apostolic Council. Paul never met Peter personally; he only met Cephas. Paul differentiates in Gal. 1f precisely between the Jewish Apostle Peter and Cephas, one of the three pillars (Gal. 2:9) whom he personally met.