In a light-saber battle, your primary targets would probably be your opponent's hand and wrist, just as it is in epee and saber fencing today.
So you wield your epee or saber two-handed eh?
Lightsaber fighting (in the movies) was based on Kendo. Not Western fencing styles.
Mark Hamil got Kendo lessons in preparation for this.
No amount of genius can overcome a preoccupation with detail.