Mark 1... Getting to the point

Mark is said to have been a companion of Peter, and therefore this Gospel he penned would be his compilation of the preaching of that great Apostle. That makes sense to me, as Peter’s demeanor was to get to the point. This narrative does not mention anything about the Virgin Birth, for example. Why? I think it is because Peter’s story with Jesus started at the baptism of Jesus, and he is going to tell what HE experienced, not waste ink on things he had only heard. So Mark’s Gospel begins with the baptism of Jesus. It’s not that the Virgin birth and Jesus’ early years were not important… it is simply that Peter wants to get to the point.