I reckon it's one of those things that just needs testing really. To be honest though, the dual saber is not invincible, just powerful - in a Jedi Master style set-up multiple players hammer the big guy into the floor, taking casualties. You always do.
Oh, the guy with the double saber shouldn't get level in all the force powers - the only change should be his saber.
Gotta say it: Darth Mollified. His face on the way down...
Mollified? Someone made him feel BETTER? More like Darth Maaaaaaaauuuuuuuuuuuuuulllll....... or Darth Oh Buggeeeeeeeeeeeerrr