So I Have Noticed a lot a rumors around the internet already that Luke is in some way or at some point in the movie evil. I found that interested and I myself have not read them myself and don't know if this is accurate or just rumors but I have heard that Luke does in fact turn evil in some way in the Book Dark empire. so as I danced that thought around my mind while watching the teaser trailer. I noticed the obvious new details that people are already starting to compliment and/or criticize. One in particular caught our attention, didn't it? we all noticed the new light saber of course! That got me thinking... what if this new light saber isn't meant for decorative purposes, what if it does actually have a real and practical use? Now that I have explained the details needed to understand what I am talking about (although I assume anyone who is a real fan would need no explanation) I would like to announce my theory! The Sith in the trailer is Luke. the small saber extensions on his Lightsaber are to protect his hand from getting cut off yet again. Bonus Theory: Luke has turned to the dark side to explore not for evil purposes, If he is the balance of the force like what has been mentioned about both Anakin and Luke, then what if he must know both the light side and the dark side?