>>So Peter, supposedly the first Pope, was not infallible in areas of doctrine, even AFTER his supposed commission as such.<<
Silly, Jesus had to died to form the church. He hadn’t died yet or his Earthly body wouldn’t have talked to Peter.
JPII died and B16 became Pope. I hope this helps you understand.
Please see my comment #38, specifically the part where I reference Galatians 2, where Paul and Peter differ on doctrine.
As I wrote there, this is challenging information, which may shake your worldview. Was Paul indeed saying that Peter’s doctrine was incorrect?