I think Paul is a true apostle. I haven’t noticed any contradictions between Paul and Christ. Where something isn’t clear, it can usually be explained by the difference in peoples access to God pre and post crucifixion.
“Then said Jesus to those Jews which believed on him, If ye continue in my word, then are ye my disciples indeed; And ye shall know the truth, and the truth shall make you free. Jesus answered them, Verily, verily, I say unto you, Whosoever committeth sin is the servant of sin. If the Son therefore shall make you free, ye shall be free indeed.”
John 8:31-32, 34, 36 KJV
When the apostles received the spirit they began to operate this role
“Howbeit when he, the Spirit of truth, is come, he will guide you into all truth: for he shall not speak of himself; but whatsoever he shall hear, that shall he speak: and he will shew you things to come. He shall glorify me: for he shall receive of mine, and shall shew it unto you.”
John 16:13-14
so Paul was taking from what Jesus preached and making it more understood Tom people who had believed the gospel
“What then? shall we sin, because we are not under the law, but under grace? God forbid.
Know ye not, that to whom ye yield yourselves servants to obey, his servants ye are to whom ye obey; whether of sin unto death, or of obedience unto righteousness?
But
God be thanked, that
ye were the servants of sin, but
ye have obeyed from the heart that form of doctrine which was delivered you. Being
then made free from sin, ye became the servants of righteousness.”
Romans 6:15-18 KJV
“If ye continue in my word, then are ye my disciples indeed; And ye shall know the truth, and the truth shall make you free”
I agree there aren’t contradictions at all between Jesus and any of his apostles Jesus was speaking the gospel d they were preaching it to the world making it more plain and explaining things from it ( taking from his and making it known )
“Whosoever transgresseth, and
abideth not in the doctrine of Christ, hath not God. He that
abideth in the doctrine of Christ, he hath both the Father and the Son.”
2 John 1:9 KJV