Originally Posted by Legion
I realize that they made Apocalypse responsible for Sinister's origin in The Further Adventures of Cyclops and Phoenix, but I don't ever recall him being Apocalypse's "herald"...where has this come from?
After years of films featuring Magneto and the Brotherhood, putting two big villains in one film seems like a bit much. But would Sinister really be able to follow The Sentinels and Apocalypse?
Level of threat? Maybe not.
But for the story, of course he can, its up to the writers to give him a compelling story even if the scale of the film isn't so big.