So some of the oral teachings from the apostles themselves could have been wrong? That doesn’t sound right…
It depends on what you mean by oral teachings.
Every word out of the Apostles mouths would not have been infallible. Just like every word out of the Popes mouth is not infallible.
To me it is common sense that the Apostles would not have been able to teach everything to the people. Just look at Jesus’ ministry. The Apostles followed Him for three years. It would not have been possible for the Apostles to spend 3 years in every town making sure everyone knew everything that was needed to be known and understood.
Where I’m going with this is development of doctrine.
So the teachings from the Apostles wouldn’t be wrong, a better way to think of it is they wouldn’t have been complete.
The Apostles would have taught the exact same way Jesus taught them. Start with the basics and get deeper and deeper as time goes on. They wouldn’t have been talking to non-Christians the way we dialogue on this website. That would be way to deep for someone who is new to the faith. They would have given them the basics. Jesus is the Son of God, Jesus died for our sins, Repent and be Baptized, Love God and Love neighbor, etc…
The deeper theology would have been taught to their disciples while they followed them from town to town. Then my thought is when the Apostles felt one of them were ready, like we see in the letters to Timothy, the Apostles would have left them in charge of other men.
For someone to believe the Apostles taught everything that needed to be known and understood in every town they came to is not thinking logically.
God Bless