Anyway, I think Vos should be out of this lists, he is just inconsistent. Tol Skorr beat the hell out of him, well I remember ILS said Vos was weakened but, I still didn't see the source for this, I need to see it.
So without Vos's inconsistency, and Windu vs. Tiin's sparring match at TPM timeline make sense, Windu wasn't known as second only to Yoda until AotC showed up, so Windu could stalemate with anyone at the Jedi council at that time.
Not to mention Krayt, he should be in tier 8, he was holding his own against RotS Kenobi way before his prime, then he become more powerful as a duelist as well.
And I still don't get the Emokin wankers, he is good but no where near at another tier than Obi-Wan, or close to Sidious, Yoda or even Mace.
As for Vader ? How can you justify that Vader's dueling abilties are good as Anakin's ? That makes no sense at all. His best dueling feats are against featless Jedi, and he get trouble with low tier duelists sometimes.