Mark, along with Quelle, is the source material for the other two synoptic gospels.
Mark was not an apostle.
Matthew and Luke are derivative works of Mark and Q
Very few serious biblical scholars still believe John the Apostle wrote the gospel.
By the way, Quelle is not a person. http://www.earlychristianwritings.com/q.html
There's far more to understanding Jesus (or any religion) than the canonical. If you only follow the canonical you are limited by the dogma of whatever denomination you choose to follow.
You believe what you believe out of faith.
The Bible declares it plainly Romans 10:17 So then faith cometh by hearing, and hearing by the word of God
I believe what I believe out of reason, history, archaeology, and linguistic research.
So your saying there is new revelation or lost scriptures
You clearly have no interest in learning anything you don't already know so I'm going to give up trying to get you to learn something new.
No you are adding words that we are forbidden to do Rev 22:18 I warn everyone who hears the words of the prophecy of this book: If anyone adds anything to them, God will add to him the plagues described in this book.
I think your way out there The bible clearly states . As I said mans opinion has nothing to do with God's word and if you had something to teach me fine but your opinion on teaching is not biblical is it? God's bible and mans opinion on the bible are as far as the east is from the west. Here's an educational site for you to do so research http://www.allaboutreligion.org/