Here's something I was thinking: what if Darth Vader appears in this, but instead of getting JEJ to return to do his voice, what if he doesn't talk?
Vader has his mask, of course, and it does what Jason Voorhees and Michael Myers has, which is it creates that mystique of fear. You don't know if they're looking at you, you can't read them, you don't know they'\re dead (for Jason and Mikey, they never are), and they don't talk. Vader, not talking in Rogue One, would be very different and would be very scary. To the point where when he does something, you don't know why; and when he appears, it'll be out of nowhere, etc.
IDK, what do you guys think?