1. I'm aware that dealing with Vong in regards to skill alone isn't better than the feats you're mentioning, but having to fight without some of the essential parts of your fighting technique (precognition etc.) for the first time makes the feat so much better than just beating Vong with no regard to circumstances.
2. Saba's very clearly one of the best of her age as well. You're deluding yourself to suggest otherwise.
3. Palpatine needed to go all out because Anakin was approaching and he only wanted Windu alive, and in another room, to play his drama out. He needed to eliminate the other three quickly, even in Mace's presence, so he unleashed himself fully. That doesn't mean it wasn't an easy win - maybe not in terms of effort, but in terms of how quickly Kit fell even with Mace's aid.
Regardless of how we see this, I think it's agreeable that what Caedus had in mind wasn't the same as Palpatine vs Kit. If you really think that, I'm just going to drop the bias claim and leave this debate.
4. The quote wasn't that Caedus would have difficulty stomping Saba, but that Caedus would have difficulty beating Saba at all. Of course it's not a several-minute long, hellacious fight for either end with no visible edge for either - I have no doubt that Caedus would very decisively cut down Saba, but only after exerting himself completely and clashing with her for a solid ten seconds or more.
Caedus isn't underrating himself because you want him to. As with all Sith, he's arrogant (not overly so, but still) and not known for his humbleness. He hasn't severely underestimated himself before - in fact, quite the opposite.
Kenth has no defined limits, so for all we know he could be Nihl's match as well. I have nothing to base that on, so I won't push the point. Saba, however, is an entirely different story. Not to mention it wasn't Kenth just being enraged that let him stab Saba, who was holding back/underestimating Kenth.
5. I don't have qualms with Nihl being Plo's match as a duelist, lol, but I do think Saba's also a match for Plo. That's all I'm saying - it's nothing against the Legacy era as a whole - and you're reaching pretty pettily if you think it is.
6. So? The simple matter of fact is that every other musing he made in that instance was utterly correct by your standards - it's a double standard to suddenly go back on Saba because she hasn't shown feats to match that. Cin doesn't have the feats to suggest superiority to Shaak, yet he is her better.
7. I didn't say Kyp's that great a swordsman. Saba, however, is. And Corran doesn't have better feats than Saba - he definitely isn't above Saba, considering he was on the defensive in the snippet of the spar we had between them, and he was making liberal use of his extended lightsaber blade as well as Saba fighting with a new style. At the very worst, Saba is Corran's equal. At best, however, she's clearly above him.