Paul's letters practically invent christianity.
The Gospels trickled in after him.
Paul never walked with Jesus and yet explains him.
Never a quote from the Master at all.
Yet, Paul is such a maven.
If Jesus couldn't be bothered to actually reveal what He was all about to his Apostles with whom he ate, drank, spoke and slept---why this persecutor, Saul?
The Apostles heard every word Jesus spoke and were willing to die for Him.
Paul didn't--yet--miraculously explained every detail of the entire history of God's purpose including his messiah.
Can anybody provide a non-gimmick answer?