Bart Ehrman is a wolf in sheep's clothing. His statements do not line up with the Bible.
With the Bible ,or not with your own interpretation of such?
Sheesh... Matthew was a disciple, Mark was a disciple, John was a disciple and wrote 5 books of the NT. 3 of the 4 Gospels was written by these men.
Even devout theologians of scholarly background don't attribute
the synoptic gospels to being written by disciples.