James was bishop of Jerusalem with all the authority of an Apostle. It was the host church for the council. But James was not bishop of all the Apostles. Peter was, taking into account the whole NT. Luke says Peter made the initial decision, you have to take off those biased goggles. James was last to speak, but it was based on what Peter initially said.
Luke is a master of understatement and says “Because there arose no little dissension and debate….” (Acts 15:2) it was decided to ask the Apostles and elders in Jerusalem to gather and consider the matter. So the apostles and some presbyters (priests) with them meet and, of course, Peter is there, as is James who was especially prominent in Jerusalem among the apostles, and would later become bishop there. Once again Luke rather humorously understates the matter by saying,
“After much debate, Peter arose” (Acts 15:7).
In effect Peter arises to settle the matter since, (it would seem), that the apostles themselves were divided. Had not Peter received this charge from the Lord? The Lord had prophesied:
Simon, Simon, behold, Satan has demanded to sift you all like wheat but I have prayed for you Peter, that your faith may not fail; and you, when once you have turned again, strengthen your brothers (Luke 22:31-32). Now Peter fulfills this text, as he will again, and every Pope after him. Peter clearly dismisses any notion that the Gentiles should be made to take up the whole burden of Jewish customs. Paul and Barnabas rise to support this. Then James (who it seems may have felt otherwise) rises to assent to the decision and asks that a letter be sent forth to all the Churches explaining the decision. He also asks for and obtains a few concessions.
There is nothing in Acts 15 that undermines Peter's primary role.
So there it is, the First Council. And that Council, like all the Church-wide Councils that would follow, was a gathering of the bishops, in the presence of Peter who works to unite them. A decision is then made, and a decree, binding on the whole Church, is sent out. Very Catholic actually. We have kept this Biblical model ever since. Our Protestant brethren have departed from it for they have no Pope to settle things when they dispute. They have split endlessly into tens of thousands of denominations and factions. When no one is pope every one is pope.
It is the Decision of the Holy Spirit and Us....On the Council of Jerusalem and the Catholicity of the Early Church - Community in Mission