St. James may have pointed to the earlier testimony of Peter alone, instead of along with that of the other two apostles who had just spoken, because it relates how right from the beginning of the Church the Gentiles received the Holy Ghost without the “law” (which definitely was understood as a “necessity of means” for salvation, as opposed to a “necessity of precept”, as the arguments of the Apostles at the Council proves). So in that regard the This Rock response was correct: its merely one example among many of the prominence of Peter. This was brought to light even further for me, however, when I found out why James may have had such a central part to play at this first Council:
“The chair of James, who first received the episcopate of the church at Jerusalem from the Saviour Himself,…” Eusebius, Church History, 7, 19,