Also, the intended way you do this with a slightly stronger than intended roster is to deal AoE damage until each enemy is low, then kill one to heal every enemy, then AoE again. Kit Fisto is good here because his AoE is weak and while he's going to counterattack sometimes he probably won't kill anyone.
But, as others have mentioned, you don't need to use jedi. Just make sure you have a high health leader, because New Nasty Vader can give you a surprise game over.