Interesting and well worth considering. Yet one must take into account that the Apostle John quotes Christ, and Paul does admit that he also preaches his own gospel as well as that of Christ. The earliest Christians had word of mouth and appeared to concentrate mostly on the Beatitudes / Sermons on Mount and Plain and the Two Commandments of Christ (Matthew) until the rest of what we now consider Scripture (along with hundreds of other books) started to circulate and be accepted.
Very interesting insight MarkBsnr. Thank you ever so much!