When Lata talks about the closed door to Maggie’s room, the painting behind her is Les Plaisirs du Bal—a scene of joy, courtship, and life. But Maggie’s gone, and the painting hangs now like a ghost of what she never actually got to have.
Les Plaisirs du Bal - The Pleasures of the Ball
In a way, it’s the same for Dean. The audience is keenly aware of that, too, reeling from the loss of him—how dumb and unfair it seemed. He's inescapable because, after all, he's this series' narrator.
We'll find out that this Dean too is stuck chasing something that's already gone—
And just like John tries to soothe the loss of Henry by helping others, cosmic Dean reaches out too—trying to help others run the race he never got to finish, in a way he never could.
Because Dean never got to dance—not like he wanted to. And he never got to dance with who he wanted to dance with. :(
Dean inherited the Campbell curse: those who never get what they want. They're the ones who work, work, work to make others happy.
Dean in so many ways is a Maggie:
Like Maggie, Dean was dancing (and dying) for the story’s pleasure—captive ballerinas, spinning in place.