Strongest foe these guys could beat?

Title says all, strongest guys these characters could beat under neutral circumstances:

1)RotS Kenobi
2) Rebels Ahsoka
3) Kana Jarrus
4) DD Quinlan Vos
5) Valkorion
6) Scourge
7) HoT
8) Wyyrlock
9) Ventress
10) Caedus

1. Darth Maul, probably.
2. Mara Jade?
3. Not sure.
4. Not sure. (Haven't read it)
5. Plagueis.
6. Darth Baras?
7. Arcann
8. Ben Kenobi
9. Qui-Gon Jinn
10. Darth Vader