About Luke's "Instakill" lightning. All I know about it is didn't it kill like 7 Vong in 1 second? Assuming it works the same on Vong as Force Lightning works on humans, and all other species, Revan and Malak would be f*cked, I think. Yoda was barely able to block Sidious's lightning, and Sidious's lightning was about to rip Mace's lightsaber right out of his hands (the novel states that Mace had no strength left in him, and that his blade bent so close to his face that he was choking on ozone, and Mace admitted to Anakin that Palpatine was too strong for him - that's when the lightning attack ceased). Luke's lightning, stronger than Sidious's, would be unstoppable for Malak or Revan, then, unless it can be proved that they are enough stronger physically than Mace that they could block it with their lightsaber. Neither of them could block it with the Force, either, since Yoda is stronger than either of them (it was stated in the ROTS novel or something that he was the strongest Jedi ever up to that point). So if Luke can take even one of them out quickly, the other one would be a goner.
That's all I've got. It didn't really show all of his powers and feats, though, just talked about his lightning.