Sadow was a master of sith alchemy, techniques that Yoda could have never learned defences against.
Sith Lord Exar Kun generated blasts of energy that could tear through temple walls and annihialte sith worms (armour plated beasts of war). Naga Sadow, was a much more formidable sith magician, and had far more trinkets(which he himself developed)
He was capable of conjuring mass illusions, and was described as a master of sith alchemy. Perhaps his greates feat was generating the required force energy to destroy a star.
I really don't see Yoda doing so well against a warrior like this, especially when he was finding it difficult to subdue Sidious (who has demonstrated a mediocre knowledge of force lightning and basic pushes) by the period of ROTS.
Actually, according to the writer of Naga and Exar, Exar is more powerful....
As I recall, it was narrated in KOTOR2 that the ancient Sith made Jedi such as Exar Kun look like children with toys. Please, include a quote where the writer says this. I am sorry but when you stated that Palpatine was the "most powerful Sith lord" it was refuted by a viable source, saying that was only a reference to political power, not necessarily force strength.
illusions mean nothing in a fight, nor will sith alchemy.
And nope, sorry, his ship's electrical weapon destroyed a star
Oh, and Yoda was the strongest Jedi ever, with a defense against every technique of the Dark Side.
Absolutely untrue. Tell me, how would he learn defences against techniques that were never known to the Jedi? Perhaps within the context of the movies where the only known force techniques were lightning, choke, and push. 🙄 Definately not within the context of the entire EU.