I think any combination would have to be a mixture of force power/skill. This tier would certainly be the most debatable, and I'd think that placement is probably based by small amounts. IDK but it'd be something like this (Also not listing Tenebrous due to lack of showings, but he'd probably be the apex of the tier)
HIGH
Dooku, Arcann, Darth Maul, Jaina Solo, Darth Malgus, Darth Nox, Emperor's Wrath, Ulic Qel Droma, Barsenthor??, Ahsoka Tano (Rebels). ROTJ Luke. Cade Skywalker
Notes: Ahsoka might be mid due to lack of force feats. Barsen might be mid due to lack of skill feats
Mid:
Bulq, Mara Jade Skywalker, Savage Opress, Darth Malak, Aryn Leneer, Saba Sebatyne, Obi Wan Kenobi, Asajj Ventress, Darth Nihl, Agen Kolar,
Low: Meetra, Zallow, Katarn, Jinn, Talon, Fisto, Koon
Imo: Vader, Tyranus, Windu, Maul, Kenobi, Jaina, Cade, RotJ Luke, Ulic, Exar, Outlander, Wrath, Arcann, Tenebrous, Mara, Exile, Bane, Zannah, Saba, Ahsoka, Revan, Malak, Muur, Galen, 'killer, GG , Malgus
May Tier 9: Caedus, Krayt
May Tier 7: Savage, Ventress, Nihl, Talon, Traya, Kyle, Corran, Nox, Barsen'thor, Agen, Aryn, Bulq, Wyyrlok
Spoiler:
Inb4Zoltans"stopsuckingCaedus'dick
Originally posted by Ursumeles
Imo: Vader, Tyranus, Windu, Maul, Kenobi, Jaina, Cade, RotJ Luke, Ulic, Exar, Outlander, Wrath, Arcann, Tenebrous, Mara, Exile, Bane, Zannah, Saba, Ahsoka, Revan, Malak, Muur, Galen, 'killer, GG , MalgusMay Tier 9: Caedus, Krayt
May Tier 7: Savage, Ventress, Nihl, Talon, Traya, Kyle, Corran, Nox, Barsen'thor, Agen, Aryn, Bulq, WyyrlokSpoiler:
Inb4Zoltans"stopsuckingCaedus'dick
Take away Wrath, Mara, Zannah, Saba and Galen and then I could agree with it.
Originally posted by NewGuy01
Looks like Mace is a high-end 8 or a low end 9, which probably makes Maul a low end 8,
And Maul's probably a mid-8 by SOD.
Explains why Mace wasn't just blitzing him the way Palpatine blitzed the B-Team.
Also as Ant pointed out, Mace's borderline 8/9 could be a reference to Vapaad boosting him against Palpatine.