I am deeply interested in the show's lore. Twilight may be best living pony, but starswirl is best pony of all time. He could totally do the timey-wimey stuff that everypony wants.
Oh I know, but being a Sombra fan I tended to think on him moreso than other characters; going by what's hinted at in the episode and what's alluded to or referenced in the comics.
Given my recent fascination for Sunset, it stands that I'll giver her some thought too.
In further argument of my point, I present a line from magical mystery cure, spoken by twilight after her friends' cutie marks have been switched: "It's not their memories, spike. It's their true selves that have been altered." true selves? If that's not destiny, I don't know what is.