Definitely not easily, Muur is seriously powerful and probably has greater knowledge/skill in the dark side. His ability to absorb Caedus's lightning and such and throw it back is also a great counter to Caedus's raw power in the force.
You could say that about times like Vitiate's era and it wouldn't be true.
Muur came from an era that, despite being early in the timeline, had a lot of knowledge and experience, and show some of the highest degree of dark side knowledge. Starting with knowledge left by the Legion of Lettow, they studied the dark arts until it got to the point it erupted into a 100 year conflict, of which Muur was one of the strongest, following by landing on Korriban where they did new stuff like create some of the greatest Sith artifacts.
Heck, we know that Vader considered the Muur talisman enough to let him overthrown Palpatine- at the possible cost of Muur becoming his new master.
When characters are talking about the gigantic power of the ancient Sith? They're talking about Muur and his crew.