Legends Grievous should take any one of them in hand to hand so long it's a one on one.
Legends Grievous VS Mace in hand to hand would be tough though.
In regards to the free for all Vader would probably hang back behind a crate and let everybody finish each other off although he'd have to deal with whoever's left.
Excluding Maul, Vader's the least physically viable due to his cybernetics although I wouldn't put it past him to take down Vastor.
Maul doesn't really count because the spider legs aren't gonna make him last very long.
Honestly, I'd say Grievous.
Krell and Savage would be a massive threat although in hand to hand I'd favor Grievous as long as he plays it smart.
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