Don't mean to burst you bubble
But according to the ground rules the Kaggath is a fight to the death, no surrender -no stalemate. Someone's gotta die.
A thought: Lets say Revan makes it to the Core, is overwhelmed by the dark side and embraces it.
Darkside Revan vs Traya & Malachor? (Basically they can both draw on the dark side energies of Malachor)