Guys, I think I have cracked it. This theory explains everything. So you remember in Magical Mystery Cure during Celestia's ballad.
'You've come such a long long way. And I've watched you from that very first day.'
...WHY HAS NO ONE NOTICED THIS?????? What exactly does that even mean?
At first I just thought she was referring to her first day of magic school but:
'To see how you might grow.To see what you might do.'
What.
So she has been watching Twilight since was a kid? But Twilight first met Celestia when she got her cutie mark right? So how could Celestia know about Twilight since her childhood? Cadence. I never really thought about how odd it was that Cadence was Twily's babysitter until Tommy Oliver pointed out, in his and Anthony C's review of A Canterlot Wedding, that Twily did not have a cutie mark in those scenes. So this was BEFORE the scenes shown in the Cutie Mark Chronicles. Why is a Princess babysitting a random child? A Princess who just so happens to be the adopted niece (is that even a thing?) of her future mentor? Is it really just because Cadence is 'civic minded' as AnthonyC suggests?
I think most of you know where I'm going with this. Put simply: THAT CADENCE IS A SPY!!!!
I had this theory kicking around for a while now but I never really took it to it's logical conclusion until I say Legend of The Everfree. And then it clicked.
It always struck me as odd how Celestia behaved in the pilot. She poo-pooed the idea of Nightmare Moon returning in her letter to Twilight, telling her to 'makes some friends' instead. And what does she say after Twilight frees her sister from Nightmare Moon?
'I knew you could do it.'
What. How?????? Can she see in to the future? Well not exactly. The reason she knew what would happen is because Twilight told her.
Think about it, all the times Twilight has been in Mortal peril or Equestria was threatened by an evil force. Her seemingly incompetent behavior in A Canterlot Wedding, her apparently nonsensical plan in Twilight's Kingdom she knows because at some point Twilight traveled to the past and told her about it. And we've seen it happen. Ever thought it kinda weird that the human world also has a Canterlot? Or an Everfree Forest? Ever wondered why the cities in Equestria have similar names? Like if you asked a pony from say, Manehatten why the city is called that, what would they say?
At some point Midnight Sparkle is going to come back. Possibly in the next Equestria Girls movie. And she's gonna bring about the magical apocalypse that turns humans into ponies and griffins et al. And of course Celestia and Luna into unicorns.
Ever wondered why the tree of harmony has Twilight's cutie mark on it? Or why the founders of Equestria look so much like the mane six? Reincarnation, baby. The Tree of Harmony is self-aware and is re incarnating the mane six Cloud Atlas style. Why else would the ghosts of Smart Cookie and Chancellor Pudding-head( I have a theory that Future is actually Luna because she has dreamwalking abilities plus she may be a manifestation of Luna's suppressed self in the dreamescape) team up to help Snowfall Frost? They are redeeming themselves for their previous lives actions. And who could be in greater need of redemption than the person who brought about the destruction of human civilization? The pony who's hubris destroyed human civilization, reincarnated first as the founder of the next and second as the one to lead the nation she helped to create!
That's right, all you bronies that were upset about them redeeming all the villians last season? This entire show has been one giant redemption story for the soul of Twilight Sparkle!
*drops mic*