Not being familiar at all with Cumberbatches work, what if....he is not the reason behind all the destruction we see? What if Wellers character appears in the film and almost immediately kills off Harrison? Harrisons appearance in the trailer is just a red herring and Weller is actually the prime antagonist throughout the film. I don't know if Benedict is a big enough star that this would ever happen or if J.J. has the skills to throw such a curve ball.
EBC that big of a commodity that he would not accept that kind of treatment on screen? (like Shatner and cameos)