Logically, Kressh should curbstomp Maul, considering he practically stalemated Naga Sadow. And if Maul manages to close the distance and gain a possible melee speed advantage, Kressh'll be able to defend himself or try and physically overpower Maul until he can get a second to "pinch off a nerve in his brain".
*Trumpet Blare*
His Imperial excellency, his most gracious excellency, his most beloved and royal excellency, recent winner of the "Lightsnake fanboy award of excellence", recent writer of the book "The Emperor's struggle with his face - why you really should not allow your sorry ass to be kicked on the ground by a stupid Jedi", recent winner of the "OMFGWTFPWNEDMYFACEISLEATHER!!!111" award and ruler of one the most notorious empire's in Star Wars history, give it up for:
DARTH SIDIOUS!
I think they stand a chance here. Maul would still get tossed away fairly quickly, and unless Malak can stay on his feet, Revan would eventually be defeated by Ludo. But if Malak manages to survive Ludo's initial assaults, he and Revan might be able to work together with enough collusion to get an opening. And considering Revan was able to use Ajunta Pall's blade without immediately going insane, as far as we know, atleast, he's obviously very. And I believe he had a good few trinkets himself from his tomb raids.
I actually saw Ludo as being much more humble than Naga Sadow, but pride is a Sith trait if anything, so I could see that.
Really I don't see much in this thread that would challenge Sadow other than Ludo vs. Revan, Malak, and Maul and Ludo vs. Kun. The former would be fun to watch, the latter a long battle with a lot of magic being waved around.
In his fight with Naga, he swung a "klunk"ing sith sword with speed enough to get blur marks and afterimages. He later completely shatters a sith sword with just his bare hands, and then causes giant statues to crumble with a clench of his fist. In those three feats alone, he demonstrates physical strength, skill with a blade, and force prowess, not to mention he was one of the top sith in the empire.