SPECULATION Kylo Ren's Secret Mission

Kymoley Ren (I'm begging you to please not downvote until you've read it all)

• The Plan

Luke Skywalker has been trying to get close to Snoke with no luck so he comes up with a plan (maybe with Han Solo) to send in a double agent and infiltrate the First Order. He saw that Ben Solo was his most promising student and trained him in both the light and dark sides with hope that he would be able to resist the dark side such just as Anakin Skywalker did. Luke then gave him Vader's helmet (which he had from the funeral pyre in episode VI) to give him strength.

"Forgive me, I feel it again. The call to the light. Supreme Leader senses it. Show me again the power of the darkness and I will let nothing stand in our way. Show me, Grandfather, and I will finish what you started."

Luke could talk to Obi Wan in the original trilogy so it wouldn't be that far fetched to think Anakin is helping him just as Obi Wan helped Luke. This idea is later reinforced when Kylo Ren in interrogating Rey.

"You, you're afraid that you will never be as strong as Darth Vader."

• The Bridge Scene

He does realize that he will have to kill thousands to save billions but facing his father will be the only way to gain Stoke's trust.

"Even you, Master of the Knights of Ren have never faced such a test"

Okay, I'm not sure if Han was in on the plan (assuming this crazy theory is correct) but the bridge scene is conveniently is front of stormtrooper witnesses and has both character going through what seems like lines for the sake of anyone listening. When they get close enough to whisper, Ben Solo changes his tone.

The Scene Dialoge

"I'm being torn apart, I want to be free of this pain. I know what I have to do but I don't know if I have the strength to do it. Will you help me?" -Ben

"Yes, anything" -Han "Thank you" -Ben

• Actor Quotes

In an appearance on Conan, the late night host questions Harrison Ford on the possibility of killing Han Solo during the original trilogy,

"I thought the best utility of the character would be for him to sacrifice himself to a high ideal"

Adam Driver has this to say about his character Kylo Ren,

"When they think of their actions as morally justified, it makes them dangerous and unpredictable. There’s no level they won’t go to to accomplish what they’re after. I never thought of the character as an evil person."


tl;dr Kylo Ren is an undercover good guy.

 

this theory relies on some very questionable things.

• even if Ben was Luke's most "promising student", as Kylo Ren he's got impulse control problems and he's an emotional mess. is this really someone who can effectively infiltrate the FO? and to what end?
  
• Kylo Ren can't hide his emotions for anything. do you really believe he could hide from Snoke a plot at this depth? there's no evidence in the film that he's capable of plotting. he even lets on to Hux that he's off-rounding against Snoke's orders with regard to the droid. not clever if he's a double-agent.
  
• a plot of this magnitude actually suggests Luke is okay with killing billions of innocent people, not thousands. that makes Luke a monster as bad or worse than whatever evil he's fighting against.

and that's just to start.

the actors' quotes bring nothing to the argument, unfortunately.

re: Harrison Ford

• Han Solo did sacrifice himself for a greater cause without there needing to be some grander plot. he gave up his life to try to save his son and even if Ren's response was not what he hoped for, he at least forgave him and asked for forgiveness as well. chances are this could be a key to saving Ren later.

re: Adam Driver

• Kylo Ren is incapable of understanding that his behavior is wrong, so of course he doesn't believe he's an evil person. Driver is remarking that villains believe that they are the heroes of their own story.

 

You've organized this well, and I'd really like to believe Kylo is working for the greater good...but as @FN-3263827 and others have said, he just doesn't have the strength of mind and emotional discipline to carry off such an undercover feat.

One thing, though, that gives me pause is this:

I had always assumed this is because he's close enough to his dad that he doesn't have to yell. But you're right...he really doesn't want this to be overheard. This is between him and his dad.

 

I am currently reading the RotS novelisation, and these Lost Twenty have really peaked my interest: the twenty (by the time Dooku left) Jedi Masters who left the Jedi Order because they had needs the Order did/could not meet. The fact that the Lost Twenty have been explicitly mentioned in the Star Wars: Absolutely Everything You Need to Know book ahead of TFA's release makes me believe that it's something we need to know ahead of TFA.

So I'm wondering if Kylo's mission has something to do with these Lost Twenty. I wouldn't be surprised if he felt a certain affinity to these disenfranchised Jedi when he learned about them during his Jedi studies. Not least because his own grandfather had become a Jedi Master (due to his training Ahsoka) before he defected to the Dark Side.

Lucasfilm have been making such a big deal of Ahsoka's own renunciation of her Jedi knighthood in The Clone Wars, and now Kanan's initial struggles in Rebels, that I believe this is just to introduce the idea of active Force users who are no longer Jedi but who have no interest in becoming Sith. Which is precisely how Kylo Ren has been described. There is something in Dooku's description of his younger self in the RotS novel that is very reminiscent of Kylo Ren's attitudes towards disorder, thieves, scavengers, and so forth. And Dooku wasn't a Sith yet when he became one of the Lost Twenty.

Also considering that Kylo wants to finish what his grandfather started (which doesn't automatically mean Vader), his mission could be related to the time in RotS when Anakin Skywalker was still struggling as part of the Jedi order, before he left. I have to rethink what that could be.