Empire Strikes back when Luke is working with Yoda, Yoda tells him two things.
That basically the dark side of the Force is more seductive because its easier and quicker. He also tells him "Once you start down that dark path it will forever dominate your destiny"
So in Return of the Jedi, Luke fights Vader and clearly flirts with or channels the Dark Side of the Force. In the end he pulls himself back, or does he. Or does the Dark have its tendrils in it.
So flash forward a few decades. Luke is training the new class of Jedi. But the Dark Side is there, basically telling him, that everything that has gone wrong has been the fault of the Jedi. I mean the Sith wouldn't have come to be without the Jedi. The Empire wouldn't have risen if the Jedi would have followed the Force and not participated in the Clone Wars, but instead they decided that they had to directly fight a war against the Sith. The old hippy saying "What if they threw a war and nobody showed up comes to mind"
So Luke is already been tempted by the Dark Side, and has that thought that the Jedi are bad. So . . . .
What if it wasn't Kyle that took down the Academy. What if it was Luke, not out of rage or revenge or hatred, but about fear of training the next generation of Jedi that will cause another destructive war with the Dark. And what if Kylo shows up and see's the destruction but saves Rey, and then like Luke before her, decides to hide her from Skywalker?
Meanwhile Luke goes into exile, right about the time that the First Order is pretty much starting his ascension. Is Luke somehow involved in that ascension . . . more on that later.
So now we flash forward. We know that Ren wants to be bad, but he's constantly being pulled by the Light. So Snoke says "Prove that you're like your grandfather, and go and kill your mother. If we wipe out the Resistance, we can have some form of peace and stability.
So Ren goes out, but he can't kill his mother, I mean he's already feeling guilty about killing Daddy. So he returns to Snoke who basically says "Your a girly man weakling, your not worth the legacy that is being presented to you, so prove yourself and get the girl.
So Ren does, he grabs Rey who left Luke because Luke basically says, "I've seen your power before and it should have scared me. I should have never become a Jedi because that power was mine, so I'm not training you. "
So Ren grabs Rey and takes her to Snoke who "Looks forward to completing your training". And he begins torturing her to turn her.
Meanwhile Fin learns of this and takes Rose and they go to rescue her. But their attempt fails and just as Snoke is about to kill them, Luke steps in with his Light saber humming and shows why he's so powerful.
He engages Snoke, but in a war of words, and Snoke basically says, "The last two Jedi are here, lets be done with this and bring peace and stability and no more force battles to the galaxy".
Ren not completely dark, grabs Rey and they make a harrowing escape and the movie ends with Rey and Ren standing in a window of an escaping Resistance ship. And we go back to Snoke and Luke talking about having patience because the Jedi will come for them looking for revenge.
So the last two questions are
Who is Snoke. Here's what we've been told, Snoke is ancient, comes from unknown space and is extremely powerful in the Dark Side of the Force. So what if Snoke is the last son of Mortis. One of the great beings that exemplified the Darks Side. I know we saw Anakin kill him at the end of his character arc, but is anyone really dead in Star Wars. Plus it would explain how Snoke knew Anakin and saw the Empire rise.
The second question is, who is Rey? A child of Kenobi, or a Child of Solo, or a child of Skywalker, or a re-incarnation Force Vergence.
What if Rey is a continuation of the prophesy to bring balance to the Force. Anakin clearly didn't do that as we have a super powered dark side sexy beast walking around, so what if in that failure, Anakin is bought back by the Force in the form of another Vergence in the Force?
Anyways, that's my crazed theory and its more then likely wrong. But what if the big twist is bigger and more mindblowing then I am your father, and its that Luke serves the dark Side of the force?