Isaiah 22:22
And the key of the house of David will I lay upon his shoulder; so he shall open, and none shall shut; and he shall shut, and none shall open.
Revelation 3:7
And to the angel of the church in Philadelphia write; These things saith he that is holy, he that is true, he that hath the key of David, he that openeth, and no man shutteth; and shutteth, and no man openeth;
Who is being referred to in Revelation 3:7? Would it not be the same person who was referred to in Isaiah 22:22?
Is 22:22 is referring to Eliakim. Read from verse 20, or even better, from verse 15.
And to the angel of the church in Philadelphia write; These things saith he that is holy, he that is true, he that hath the key of David, he that openeth, and no man shutteth; and shutteth, and no man openeth
There is no contradiction here, but reinforcement. The keys are the symbol of dynastic power and authority in the Davidic monarchy. They belong to the king, and their power and authority is given by the king to one whom the king designates to act in his behalf.
Well then, that must be Peter in Revelation...Peter's going to show up on a white horse...