I think you are reading into it a bit too deeply, and making analogies where analogies aren't. It's a story, so read it as such. I am not convinced that, say, Lucius is meant to represent Draco's peer structure any more than the amount which he is part of Draco's peer structure in-universe (being his father).

Oh and one more thing: For Dumbledore's 'Life Is A Story' pitch, think a level up. The character's don't know it, and they probably never will, they are just that, when all else is stripped away. In the end, at the highest level, their life is a story. Ponder that for a while...