Much like the appetizer, David was giving Israel a taste of what was to come in Jesus, the main act of the meal. A good appetizer will excite you for what’s to come, it will give you a taste of what is to come, but it cannot fill you up fully. That’s the main course's job. To fill us.
You see David is extremely important in this story. In fact it’s hard to find another character in the Bible as important as David, besides Jesus. He’s instrumental in the story of God moving in his people.
But this story is about a King coming who would do what David could not - Finally make things right.