Starlight: "Spare me your overblown ego! No group of friends, not even Princess Twilight's, is that important!"
Twilight: "I don't know why my friends and I are so important to Equestria... but we are."
Starlight: "Ugh! What's so special about your friends?! How can a group of ponies that are so different be so important?!"
^ I'm hoping that all of this is foreshadowing. That season 6 will explore the reason why Twilight and her friends are so special.
It seems like Starlight is asking questions that the fandom has been lobbying for years, and maybe this is a promise of
finally answering those questions, especially since even Twilight admitted that she didn't know.