The team was so unbalanced when Twilight ascended. Starlight brings back that desired symmetry :3
That's one reason why I like her so much ^^ I think the gang needed one more member, and it only makes sense if she's Twilight's student.
more the the seperation of Glimmer
One word, Balance. Wow
its... the... FINAL COUNT DOWN!!!!!.... wait gotta start at number 5