Neither do we.
>>Paul isn't teaching anything Jesus didn't teach.<<
Then why the reliance on Paul? If Paul taught nothing that Jesus did not teach, then theoretically one does not need to rely on Paul at all, and only concentrate on the Gospels, right?
Reliance on Paul? Are you denying that the words of Paul were not words the Holy Spirit gave Paul to write? Paul was after all the Apostle to the Gentiles right? All the gospels are used but the words of the Holy Spirit to Paul were specifically meant for us Gentiles were they not? Would you deny that by quoting Paul we are quoting the Holy Spirit?