Because he is under the authority of the bishop, and my bishop (Archbishop Burke) is under the authority of the bishop of Rome (Pope Benedict XVI), the heir and successor of St. Peter. Christ said He would build His Church on Peter, and promised that the gates of hell would not prevail against His Church, and gave to Peter the keys of the kingdom, and promised Peter and the Apostles that He would send them the Spirit to guide them into all truth.
-A8
That's your interpretation.
FYI
http://www.christendom-awake.org/pages/mcgovern/exegesis.htm
Good stuff. Dei Verbum nails it, FRiend. BTW, your Archbishop is great! I am an avid admirer of Archbishop Burke. He is "a man with a chest" to quote C.S. Lewis.
Frank