Skywalker loses a lightsaber fight, certainly. But he outclasses all three in Force potency and nothing suggests that they would make a cogent team; Anakin can be tossed aside handily with the Force, eliminating the severe threat he poses as a lightsaber duelist. Bane's orbalisks would fall to Skywalker's potent "emerald lightning", capable of instantly killing a Vong Slayer (specifically, the Supreme Overlord's obscenely deadly caste of bodyguards). So in a strict Force fight, the trio might prevail due to their numbers and their own prodigious skill. But in an all out fight? I'm not certain.
Don't worry, I acknowledge Luke Skywalker as the most powerful force user in the SW mythos. And Bane, individually, may be able to 'compete' in a pure lightsaber duel, but he really doesn't stand a chance in a fight with Luke.
So, you think Luke will be able to use the force to disarm Bane? If so, Bane will die (without his lightsaber, I know he doesn't compete with Luke). Anakin and Revan will most likely die against Luke, especially considering the fact that Revan's lightsaber skills are virtually unknown. And as you said, while Anakin is a threat in a lightsaber duel, his lack of force defenses can get him to get ragdoll'd rather quickly.
The thing is, I'm not certain Luke can just use the force to "WTFpwn!" anyone on the trio before they close up on him and decimate him in a lightsaber duel. It seems plausible that the one he will take out is Anakin, thanks to his lack of force defenses- and Bane and Revan vs. Luke? I don't know if he can beat a Bane who is pounding at his defenses while Revan is launching all sorts of force attacks as him. Not exactly sure, though.