Menschensohn
First, one does not find others ever describing, addressing, or confessing Jesus as the Son of man apart from four marginal cases (; ; ; ). In the last three cases one is dealing with quotations from the Old Testament. In the Gospels themselves other people address and speak about Jesus in a variety of ways, but never directly as "Son of man". According to , the audience of Jesus were puzzled when he referred to himself as "the Son of man". Now, if the early Church had freely created the Son of man sayings, it would be puzzling that this designation for Jesus is not found on the lips of others. The puzzle disappears once it is agreed that there is here a genuine historical recollection: only Jesus used the term, and the evangelists and their sources faithfully recorded that fact.