Originally posted by Psychotron
We saw the duel between Vader and Obi-Wan and Vader never tried any Force attacks. Maybe he just wanted to out-duel him to avenge his previous loss. If we're going by your reasoning then ROTJ Luke is a peer to Vader in Force abilities because Vader didn't own him with the Force.I'm aware.
Old Ben took out Maul quickly because he knew what Maul was going to do and how to counter it. It was pure skill. I don't disagree that ANH Ben was close to Vader as a duelist, but that doesn't mean he'd beat Mace Windu.
He's definitely not above Sidious so that's how good that source is.
Whether you agree with it or not, canon is canon. There is nothing in canon that shows OR states that Vader's skills have diminished with a blade. His feats have shown he has improved vastly in the force and a canon sourcebook indicates his saber skills if anything INCREASED, since he's the best red lightsaber duelist there is.