In case of Force only then.
Warmup: Quordis - Xesh can easily replicate Bane's execution, lmao.
1. Aayla Secura - Aayla has literally no defense. She can't possibly win.
2. Alema Rar - more tricky. Honestly? Alema can put up a fight, she has some surprisingly enormous feats, but Xesh is more powerful, more masterful, and has laughably more options and skill in using Force combatively.
3. Darth Nihl - never really got that reputation Nihl got in the Force department. His Lightning is powerful enough to kill Kol Skywalker when he has unknown amount of focus and shoots him in the back, when Kol's sabers are kinda occupied killng bunch of other Sith lol. Choking out Cade from hiding when Cade is entirely focused on fighting Talon, especially when Talon is still a difficult fight for Cade at that time, is also worth little for me. At best, Nihl fares as well as Alema does.
4. Obi-Wan Kenobi - Xesh is definitely just more powerful, has much greater amount of abilities, and while honestly Kenobi is equally masterful and skilled in combative/tricky Force usage, Xesh's far greater power and huge versatility gives him 10/10 win.
5. Kenth Hamner - quite a close one. I don't honestly see the difference in Force power, but Xesh's mastery, skill in combative use, and amount of abilities at his disposal can provide him with a very tough win. Both have the same "guns" in the Force, but different skill.
6. Arcann - Arcann insta-kills, Anakin+ levels are the only legitimate fights in Force only for Arcann 👆
Boss: Reedemed Revan - Revan insta-kills, Yoda+ levels are the only legitimate fights in Force only for Revan 👆