The mystery was revealed to Paul Ephesians 3:3
There is no claim by Peter and the twelve for this revelation.
hat is not what scripture says.
Eph 3:4-5
"When you read this you can perceive my insight into the mystery of Christ, which was not made known to the sons of men in other generations as it has now been revealed to his holy apostles and prophets by the Spirit"
Where does it say the mystery was not known before Paul?
It doesn't!
It was not made known to previous
generations
Eph 3:5 Also says the mystery was made known to Christ's
holy apostles and prophets.
In other words it was made known to Peter, James, John etc.
You are trying to push a wedge between Paul and the apostles that Jesus taught for three years.
That's false.
In 1Cor 15 Paul writes about How Jesus appeared to Cephas and then to the twelve [apostles]. He then goes on to say he is the least of the apostles.. He doesn't distinguish himself as a different kind of apostle to the twelve.
He then goes on to say: "
Whether then it was I or they, so we preach and so you believed." In other words they[the twelve apostles] and Paul taught the same.