Hildebrand:
Where did anyone say they were the same keys as Isaiah 22? That was a completely different office and authority - the key (authority) given in Isaiah 22 was Steward of the Kingdom of Judah. The point of going back to Isaiah 22 is to understand Matthew 16 in context. Jesus was telling Peter he would give him authority over the Kingdom that Jesus was establishing and bringing to all peoples.
The authority Jesus has is Kingship. Jesus NEVER abdicated his kingship to Peter. Both have authority: Jesus has authority as King, and Peter has authority as Steward.
The Kingdom that Jesus is establishing is in us.
And when He was demanded of the Pharisees when the
kingdom of God should come, He answered them and said,
“The kingdom of God comes not with observation. Neither
shall they say 'Lo, here! Or, “Lo, there!” For behold, the
kingdom of God is within you.” (Luke 17:20-21)
Your exegesis of the verses in Isaiah is weak.
You claim that Jesus made Peter steward of His Kingdom, but Isaiah 22 clearly points out that the stewardship extends to only one person: Eliakim - NOT a line of successors (your understanding of Matt 16 suffers from the presumption). And when his family became proud of the office it was taken away. There is no succession of this office beyond Eliakim.
Secondly, it is clear from the text that the office was removed from Eliakim’s family because of performance, or lack thereof. If this was truly a passage pointing to the papacy, Catholics would have no basis to claim that popes such as Liberius, Honorius, Alexander VI, and others cannot break the line of succession of the church. Does that conform to what we see here in Isaiah 22? No, not at all.
Peace