That doesn't change the fact that for 2/3 of the trilogy, Vader was the main antagonist. What he did for his son, at least in my opinion, does not make up for all the evil shite he did in Empire, New Hope, and even Revenge of the Sith.
It doesn't change the fact that the story was set-up to be a redemption story for Vader and since you
don't count Revenge to exist, can your point even be valid
Regardless of screen time in the trilogy, Palpatine most certainly is the main antagonist. If the trilogy is one continuous story of the Rebels finding freedom from oppression of the Empire then the parallel story is Anakin Skywalker freeing his weight of past sin and slavery to Emperor Palaptine shown even in the scenes in Empire
. By the end of Empire, Vader openly talks about killing the Emperor, to the protagonist of the film-Luke. There is no possible way you can consider him the antagonist of the film if he is contemplating. By Jedi
he is nothing more than a "yes man".
now back to Bane-whom very much fits the mold of someone taking orders the entire time, Bane has zero motivation to attack Batman/Bruce or Gotham as an individual, but Tailia does the plan was her all along and she is pulling the strings.