Either way, Mace loses, All the guys with names plus countless other Sith, as weak as they may be, vs. one Jedi Master? The Jedi goes down hard, even Luke would likely lose (I'm not sure how many Sith there are in the NSO, though). Just the heads (Krayt, Talon, Nihl) could likely take Mace, though - as far as I know, all we see of Krayt is him owning some Imperial Knights, which is impressive, plus his armor is lightsaber resistant. I would guess that he alone could give Mace a decent fight. Add in his 2 strongest underlings, however weak they might be (and they arn't that weak, slightly above avg. or pretty strong) and I don't see Mace winning, however, he'd likely put up a fairly good fight.