Darth Revan vs. Darth Maul - Maul. Revan at this point has better esoteric Force feats, but doesn't have the demonstrated combat ability or scaling to win especially up close, though I guess he'd beat TPM Maul.
Lord Nyax (amped) vs. UnuThul - difficult to say. Possibly Nyax - he did far better against Luke, even if it may have been a weaker Luke.
Darth Bane vs. SF Malak - probably Malak. Not sure if Bane solidly surpassed the top-tier ancients given his own doubts about his ability to, though by his peak it's possible he could give Kun a good fight.
Obi Wan vs. Darth Nox (TK battle) - Obi Wan. Stalemating Vader's TK on Mustafar, etc. meanwhile Nox is trash compared to higher tiers.
Mace Windu vs. Vaylin - Windu easily.
Boba Fett vs. Jango Fett (equal equipment) - Boba?
Clone trooper vs. super battle droid (both with lots of cover) - Maybe the SBD, barely, due to greater durability.
Droideka vs. YVH droid - YVH, not sure how the droideka is hurting it.
Elite magnaguard (Invisible Hand) vs. Vong Slayer - Slayer stomps.
Shimrra vs. Valkorion - Shimrra unless if Valkorion has prep and battle plans far more intelligently than he normally does.
RotS Sidious vs. RotJ Sidious without a lightsaber - not sure actually.
Abeloth vs. Vader's Death Squadron (no TP, Abeloth on a planet, fleet in orbit) - not sure.
Luke Skywalker vs. Terror from Beyond - Luke.