interesting - secret source of Christianity.
And here all this time I thought it was the living Christ Jesus.
Which very well be the reason there is not much to the story as being some secret source of Christianity. I doubt Jesus having had an additional source of Christianity that was kept secret would allow it to remain a secret for very long. If the secret source had any divine legitimacy, he would never have it remain secret, never allow his followers to remain deprived of it.