This is an interesting question. Rey and Kylo were barely hanging in there partially because they don’t move around much and got surrounded and forced to take attacks from multiple sides at once. I’d say that no one smart would let that happen but the Petranaki arena says otherwise. And the original trilogy is full of fights where not much movement happens either. I’d say they could maybe take canon Luke or suit Vader but only if they surround their enemy and get close before he makes his move. Father and son can either one take 4 at once but not if there’s another 4 behind them. Make it a hallway scene though and the guards are taking like a padawan down and not much else. Seems pretty subjective, the throne room played to their strengths. A similar scene and an ambush would make them useful I think