>>Fair enough.
Question for you: why have not the Gospel of Thomas and the Gospel of Judas been added then?<<
You would never get the various Christian factions to add a book now. The Vatican is only central authority that could possibly push such a thing and they have already examined those books.
That said, I think it is possible that there were genuine accounts of Jesus that are not in the bible.
John 21:25:
But there are also many other things which Jesus did which, if they were written every one, the world itself. I think, would not be able to contain the books that should be written.