I also wonder why they are taking Labyrinth in the direction of Toby being the goblin king's heir, instead of focusing on what happened to Sarah after she left the Labyrinth.
From reading the movie novelization, the picture book, and watching the movie there are three endings:
1. Novel- Sarah puts her entire childhood behind her without looking back.
2. Picture Book- Sarah remembers the Labyrinth as a story to tell her children.
3. Movie- Sarah remembers the Labyrinth, but still holds onto aspects of her childhood.
I wonder if the comic books will focus on these at all.