Yeah but I'd u got a guy who's really strong using dual sabers, than can't he use power attacks? I mean take kephess for example, even tho he's no jedi, he had two swords and all he used were power swings
But what is stronger, A guy wielding one sword with two hands swinging, or a guy with one hand holding a sword swinging?
It's actually a proven fact that while the two sword styles give you more flexability and mobility, you lose a lot of power per swing, and you lose a lot of defensive.
If you try to do a double guard block against somebody using Djem So to hack at you, he will break your defenses.