The trick there is if balls of steel are maintained and it turns out or new Jedi heroin is actually the one that slaughtered all Luke's academy people while she herself was a child, and not Ben Solo, "Jedi" will have no play. If thats to be, Ben would take the blame and accept the lore for what was done as he wants to be something he isnt where Rey is both good and evil in one package. The seeds for this are planted in TFA where whenever the force shows in her (under duress) she becomes enraged as if its a dual personality. Something/someone else seems to take over. To keep anything like this a secret, the title itself would have to lay focus on something unrelated, such as the rise of the new empire. There is nothing to now stop them from forming minus a very small band of rebels. Something extraordinary would have to materialize to help fight the new empire from within, hence Ben/Kylo Ren would turn to the light side as thats where his true higher power comes from. He's torn and conflicted in TFA because he simply wants to be powerful yet is misdirected by (I hate saying this name) Snoke. He would likely sacrifice himself to save Rey. Full circle.