You make some interesting points. However, Peter and only Peter (Cephas, big rock) was given the keys to the kingdom. True, all Apostles got the power to bind and loose later. But only one person can hold the keys at a time, as shown in Isaiah. Also, the Pope must speak ex cathedra, from the chair of Peter, to fully exercise the primacy. The Pope is also Bishop of Rome. We never see him acting in that role because as Pope his travels and words carry weight worldwide. It doesn't mean you agree with what he says, but he isn't speaking infallibly when answering a question. Peter and only Peter, before Jesus ascended, was told by Jesus to strengthen the other Apostles. Debating something settled at ecumenical councils only keeps Catholics and Orthodox apart. Wars, politics, and egos have kept us apart too long. While we debate, the evil one is trying to destroy us all. Let's focus on winning souls for Christ.