This movie may not be "canon" but that doesn't change anything for me. The movie helps give you more background into the life of a very important character to the series, and also helps solidify all their friendships in the process. It especially made you feel for the characters as their pasts came back to haunt them. The writers also did a very good job of not messing up any of the timelines either. I bought the movie, and I do not regret it. It is beautifully done and definitely worth the watch!