I just saw one that threw out the Rey was a student. Luke mind wiped her KOTOR style because she was going all dark. Kylo and other students had issues with that and that's why they turned against Luke.
I prefer this retcon personally. It fixes a lot of character motivations and adds some depth to everyone.
The point still remains that could've done anything yet they made Luke a homicidal bad touch uncle.
My random fixes for the whole trilogy that I've been thinking over the last few days.
Luke starts his academy with a more relaxed approach to training because he believes the strict teachings lead to the creation of Vader.
A dark presence has been slowly corrupting Ben since damn near the day he came out of the womb.
He's been on some We Need to Talk About Given shyt and Leia's on her politician tip so she sends him to Luke.
Luke starts training Ben and makes progress with him but he's still conflicted. One day Leia is exposed as Darth Vader's daughter and Ben never learned this information. He's fukking pissed. Luke gives him the run down of everything that happened with Anakin and says some poignant shyt and ends it with "let the past die" (So "Let the past die, kill it it if you have to" is a perversion of something Luke said to him).
One night Luke feels a dark presence he's never felt before and goes to check on Ben and he sees him having a Force Skype call with a tall pitch black silhouette(Snoke). The dark figure points toward Luke and Ben Solo stands up and ignites his lightsaber. Luke refuses to fight him and just dodges his attacks while trying to talk to him. Ben is crying and shyt because he aint a killer like that but he force pushes Luke a wall and knocks him out.
Ben kills mad nikkas at the academy but many escape. Luke thinks Ben's killed his wife since he can no longer feel her and this breaks his spirit.
The old nikka from the beginning of TFA escaped from the academy massacre with Luke's wife who was in the early stages of her pregnancy at the time of the attack. Luke can't feel her because she cuts herself off from the force.
Rey's mother is like a Star Wars version of Jean Grey, she's powerful in the force but she trains her mind over physical fighting.(This is why Rey can pick up on the Jedi Mind Trick and shyt like that so easily)
Since we can do all types of shyt with the force now. Rey's mother imprints bits and pieces of memories onto Anakin's lightsaber and gives it to Maz for safe keeping(this is where the crazy Force vision stuff in TFA comes from).
After years the old nikka from TFA and Rey's mother get word of a Jedi Killer(Ben) searching for any Jedi sympathizers and specifically Rey's mother. She escapes off world to draw Kylo as far away from Rey as possible.
While all this is going on Luke has become obsessed with the old teaches of the Jedi and starts hopping from one old jedi temple to the next in search of information of this dark figure he saw. (In my version Snoke is Darth Plagueis)
That's all I got.
God dammit man, this trilogy could have been fire.