Here is something else to consider. The Gospel of Mark was the first written gospel, not Matthew.
Luke was written several decades after Matthew, perhaps at the end of the first century. And John was written much later.
That being the case the Gospel of Mark was the cleanest of them all. By this I mean no extra embellishments.
A good example of this is the Gospel of Mark did not have the story of Jesus's birth and the three wise men or whatever you want to call them. Mark also didn't have the killing of all the babies, or the young Jesus teaching older men story.
Reason being is because these stories had not been "Created" YET to embellish the life of Jesus. So the stories were not in circulation when the Gospel of Mark was written. Meaning that the author of Mark had not heard of such stories. Those stories came years later. Remember the author of the Gospel of Mark was not an EYE WITNESS.