In response to questions about whether Mt 16:17-19 indicates that Peter was the leader of the apostles and whether Peter passed on that role to future bishops of Rome; I had these comments.
First let us look at Is 22:20-23 which is the first mention of this/these "key(s) of the house of David".
"Then it shall be in that day, That I will call My servant Eliakim the son of Hilkiah; I will clothe him with your robe And strengthen him with your belt; I will commit your responsibility into his hand. He shall be a father to the inhabitants of Jerusalem And to the house of Judah. The key of the house of David I will lay on his shoulder; So he shall open, and no one shall shut; And he shall shut, and no one shall open. I will fasten him as a peg in a secure place, And he will become a glorious throne to his father’s house.
Is this a reference to the kind of authority Peter will have? Who is Eliakim the son of Hilkiah?