The 'Lighter' Side Of The Force
What if someone close to Ren died and he wanted the power to bring them if it is Darth plagues he's the only one who can do it. He might be going to the dark side just to gain the power and then he can bring back his father and someone he lost.
Dude says "necessarily" a lot.
Anakin did bring balance to the Force! There were a lot Of Jedi. He killed them all! Two Sith and Two Jedi remained. Balance. Profecies don't always mean what you intend.
I think Rey is a clone of Vader. Young excellent pilot, great inventor, etc.