Satanus- certainly people are aloud to disagree on issues and openly discuss them. Paul was a different kind of apostle who met the glorified Jesus. The other apostles had known the man. So one could see how they make look at things a little differently. That said, The Jerusalem Council in Acts [15] was presided over by Peter, not James [who was the bishop of Jeusalem], and not Paul. Peter led it and his decisions were accepted by all there.
It is also worth noting some other examples showing that Peter was the Rock of which Jesus spoke [aside from the obvious Mathew 16;18].
In John 21;15-17 Jesus asks Peter to feed his sheep [3xs]
In Luke 22;32 Jesus prays that Peter's faith would be strong so that he could in turn stregthen the other apostles.
In Acts 3;6-12 Peter performs the 1st miracle after the Pentecost.
Acts 2;41 he was the first to perform a mass baptism.
In Mark 16;7 an angel of the Lord tells the women at Jesus tomb to tell Peter and the other apostles about the risen Lord.
To name a few examples of Peter's authority.
respectfully,
dc