John 14:26 But the Comforter, who is the Holy Spirit, whom the Father will send in my name, he shall teach you all things, and bring all things to your remembrance, whatsoever I have said unto you.
So you see. The apostles were the ones who would write down what Christ taught them. Christ didnt teach all those others personally did He.
Did Christ teach Saul/Paul personally, other than knocking him down with a bright light, and asking Saul why he was persecuting Him?
(I have to leave now, but I'll try to check back tomorrow for your civil and astute response.)
What Jesus promised in John 14:26 was a Paraclete. This Paraclete, both the giver and the gift, is what ensures the ongoing inerrancy of His Church.
Peace be with you.