Registered: Aug 2016
Location: Pennsylvania, United States
I think it depends on just how huge the disparity between the ultra powerful combatant and the team members actually is, and how combat oriented they are.
I could see a team of Revan, Outlander, and Vaylin beating Valkorion because Valkorion isn't really a fighter. Just look at vanilla ToR, when he, as Vitiate, literally walks right into the HoT's lightsaber. Albeit he was much weaker than normal, but the point remains. Someone like DE Sidious or FotJ Luke, who may not be vastly more powerful than Valkorion, but are EASILY much better COMBATANTS, can deal with a team like what was mentioned, far more effectively, because Luke or Sidious possess the same general skillset as the team (incredible power in the Force) but they also possess what a Valkorion lacks, which is saber skill, heightened situational awareness, etc, things that are vital to fighting multiple opponents at once.
A good example of this is actually when Revan attacked Vitiate in his throne room in the novel. Despite being well below Vitiate in regards to power, Revan posed a legitimate threat because he was much more well rounded as a fighter. Multiple super powerful Force users that are more well rounded than their target, would (in most cases) inarguably have a much better shot at downing said target.
Hopefully that made sense.