hhhmmmm, so you've got Bandon, his two dark Jedi, Calo Nord, and his two bounty hunter chums?
Oh, the first time I did the game through I just killed Calo(but I saw his outline in the party selection screen) but can't you convert him to your side?
Then you could have Calo to help you with bandon.
But anyway, if you've got all 6 of them there(in a confined space?) then I'd suggest getting three people to throw thermal detonators like crazy
3 against 6 will be pretty difficult if you try to take them on man for man, so you might as well do your best to fight them as a whole group.