Anyway, on topic, no Vader as he was in SW originally should not have been shown in the PT.
This for me too. I am sure the PR, marketing and merchandising people were overjoyed at it being the film and being able to use such an iconic image. But it really had no business being shown in the PT from a story point of view. The end few scenes in ROTS just summed up the rushed box ticking that was going no in the last Prequel film.
(That is also ignoring the awful way the scene was actually executed - Noooooo!!!)