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Benchmarks:

S Tier:
Yoda

A Tier:
Dooku

B+ Tier:
Kenobi

B Tier:
Kit Fisto

B- Tier:
Agen Kolar

C Tier:
Aayla Secura

D Tier:
Coleman Trebor

F Tier:
Darth Bane

People to scale: Vandar Tokare, Vrook Lamar, Atris, Kavar, Zez-kai El, Lonna Vash, Zhar Lestin, Dorak, Darth Malak, Darth Bandon, Uthar Wynn, Yuthura Ban, Nihilus, Sion, Kreia, Nyriss, Revan, Meetra

This isn't meant to be based on feats necessarily, just more your guestimation.

Fun Fact: The dude who plays Vrook Lamar voices the grandpa from Up and Ed Wunsler on the Boondocks

Only a few:
Atris: B-
Malak: A-
Bandon: C/C+
Nihilius: Somewhere between S and A, to huge of an gap
Sion: B/B-
Kreia: B+
Exile: B+
Nyriss: B/B+
KotOR Revan: A

Originally posted by Lord Stark

F Tier:
Darth Bane