Lina Shields said:
We can argue that Vader is much more skilled than Anakin due to more knowledge, but Vader lost a lot of force potential due to his injuries back on Mustafar.
Also, in the EU version of Star Wars, Palpatine managed to get a lot stronger than before after cloning himself with a younger body (that version of Palpatine managed to be stomp Luke Skywalker and make him into his apprentice for a while I believe)
No... Palpatine didn't body swap until Dark Empire, which is faster his death aboard the Death Star.
He lost the potential to be 200% of Sidious' power, instead he was "Capped" if you will, at 80% of Sidious' Power at the time of Return of the Jedi.
In Dark Empire, Sidious and Luke are both leagues above Vader, no one is denying that, and should still be.
While Vitate is a good power-scaler, you have to remember the sources and the power of the Dark Side at the time of Vitate's Empire.
Darth Plagueis, the one who taught Sidious so much about the force, should be *stronger* than Vitate.
In Plagueis' novel, both Plagueis, Sidious, and Plagueis' Master, Tenebrous stated that Plagueis, not Sidious was the Dark Lord that the Bane Line had been searching for. Sidious defeated Plagueis not through strength but deception. If you ask me, it's not that Vader would be too strong, that Sidious and the like would be *too weak*
They literally state that Plagueis is "The strongest Sith Lord that has ever lived" Before Sidious destroyed the Order. Meaning that Plagueis should be above Vitate, and Sidious was Leagues above Plagueis, meaning that Sidious should be *leagues* above Vitate's feat.