>>677720
Peter is shown to have the authority of primacy among them, but I don't know of scholars who seriously think he was given a rank above theirs. Rather, his primary role among the apostles was to be a bridge and peacemaker between James and Paul.
Isaiah 22:22 is directly about Jesus, as Revelation 3:7 tells us. To apply it directly to Peter would be like to apply references to the Rock in the OT to Peter as well.
>>677399
Pastoral and doctrinal authority conferred by Christ. Halakhic decisions. It is also the power to retain or forgive sin and to include or exclude from the assembly. Peter is essentially instituted by Jesus as "supreme Rabbi".
Jesus has this power supremely, but confers it to Peter, and through Peter it is conferred to the apostles (Matthew 18:18), and through the apostles to every bishop. Interestingly, we also find that Jesus is the Rock, but He confers this title to Peter, and Peter confers it to the right-believing faithful in 1 Peter. And Jesus is the Good Shepherd, but He confers to Peter the role of shepherd in John, and Peter confers it to the bishops in 1 Peter.
It is also implicit, because of the schema, that Luke-Acts makes Paul a "successor" of Peter as well, in his doctrinal and pastoral authority and his ministry. Luke-Acts has a schema of Jesus->Peter->Paul, assuring the Pauline communities that through Paul they are linked to Peter, and so to Jesus.