Nai Fohl
Advocatus Diaboli
Since you added Bandon to the Sith side...
Mace (ROTS) vs Tyranus = standstill or Mace win after a long battle
Qui Gon vs Nihilus = Nihilus
Yoda vs Sidious = Yoda long battle
Obi Wan (ROTS) vs Vader = Obi-Wan
NJO Luke vs Revan = standstill
Bastila vs Visas Marr = Bastila all the way
Jolee and Juhani vs Maul = Jolee and Juhani easily
Atris vs Sion = long fight probably Sion
The Exile (Lightside) vs Traya = Exile wins
That leaves:
Mace vs Tyranus (fighting)
Yoda vs Sidious (fighting)
Luke vs Revan (fighting)
Bastila; Jolee and Juhani; Exile; Obi-Wan for the Jedi
Sion on the other side
The Exile + Obi-Wan team up on Sion while the three Sith who are still fighting each receive an additional opponent and all go down.
Since Sion is pretty much not killable Mace, Yoda, Luke, Bastila, Jolee, Juhani, Exile and Obi-Wan cut his arms and legs off, sit his body on a chair and talk him into give up the force (and die) through a 12 hour psycholocigal therapy.