Not really totally disagreeing with you on these two factoids. Just saying that Paul was "ordained" by Jesus (after His death, burial, and resurrection - indeed proving His authority as well as redeeming those who trust in Him) to preach the Gospel to all men. And, therefore, Paul's teachings, his writings, are an authoritative (inspired by God) continuation of what Jesus taught; and not a new innovation or a new gospel from Paul in or of himself. Even Peter agreed with this -
2 Peter 3:14-17 – NASB - Therefore, beloved, since you look for these things, be diligent to be found by Him in peace, spotless and blameless, 15 and regard the patience of our Lord to be salvation; just as also our beloved brother Paul, according to the wisdom given him, wrote to you, 16 as also in all his letters, speaking in them of these things, in which are some things hard to understand, which the untaught and unstable distort, as they do also the rest of the Scriptures, to their own destruction.