Stage 2 Demonic "possession" is Mark's metaphor for alien ownership. That is Mark's deeper diagnosis for all of the people to whom and for whom Jesus comes, not just the one man in the synagogue patently possessed. Their deeper need is ownership-transfer. To be liberated from alien, deadly, owners and to be brought back under God's ownership. By not moving into Jesus' field of ownership, the best they have is that coming from the teachers of the law. That's not good enough for coping with demonic possessors.
Stage 3 Final destruction. If no one "stronger" comes on to the scene, with "greater authority" than the alien possessors, these possessors will destroy what they possess. One of the Bible's names for the prince of the demons is "diabolos", which literally means destroyer.
Stage 5 When such liberating ownership transfer actually takes place in a human being, it is wrenching (v. 26). It's like dying and rising, like confession and absolution. It is "repenting and believing the good news," as Mark told his readers a few verses earlier (1:15).
Stage 6 Mere marveling at Jesus' authority is not living under that authority. "Follow me" (1:17) was his earlier word for living daily life under his Mercy-Messiah authority. Throughout Mark's Gospel he does not show us many examples that model such discipleship. Even the 12 disciples seldom model faith-full discipleship. They seldom show that they comprehend Jesus' authority, that they themselves have undergone the primal ownership transfer, and are now patently living their daily lives in the force field of Jesus authority. The demons throughout Mark are on target about Jesus' authority, the disciples never. Best examples for real discipleship in Mark come from odd-ball, "ochlos" outsiders: the centurion at the cross, the blind man at Bethsaida, the Gerasene man exorcised of his "Legion" of demons, the bleeding woman, and the widow with but two copper coins. For more concrete pictures of Stage 6 see the second lesson for this Sunday, I Cor 8:1-13, one of Paul's classics for discipleship under Christ's authority.