CC, there is no doubt that Paul told them what he KNEW himself. Study and you will find, as I showed you in the scripture, that he was NOT taught by oral tradition, but rather divine inspiration. He was an apostle, as though one born out of season, but Jesus appeared to him directly. And the other apostles accepted him. He even stood and rebuked the other Apostles in Jerusalem over the circumcision issue. And the others Accepted his correction.
That is wholly different from what was aptly called the "telephone game." The concept of new revelation is to be rejected by reasoning men. It allows us to constantly reinterpret. God does not change. There is pressure on the Pope every day to change the word of God. And often they do. But, it is my contention that they do so in violation of the scriptures, not because someone found some dusty tradition that had been forgotten. Again, God does not change, nor does his word.
Yes, certainly, Paul had taught many Christians directly, telling them by mouth what he later wrote to remind them of, but that is not an excuse to ignore the written word. Our memories may fail us. Our consciences betray us as do the desires of our heart, but the word stands.
As for the accuracy of scripture, that can be established in many physical ways. Scripture has been around a long time, copied and recopied, translated into many languages, spread over all the earth, and then translated back again...and yet there are very few words even that are disputed from one text to another. None that significantly affect the doctrine. The word of God stands firm. The words of men are like dandelion spores spreading on the wind. One never knows where they will end up. And the rock stands as a firm foundation for us. I have no faith in claims of an oral tradition of 2000 years and more, that changes from time to time, as compared to the unchanging written word of God.
If you want to prove my point by the way, look into the acceptable recipe for unleavened bread and read of the rabbi's discussions on this. Are we willing to accept traditions or let the bible speak? Again, simple enough for me to allow God's word to speak and the words of men float away on the wind.