I wouldn't say Xizor is completely useless (though the scenario that I will provide will make him such). And Traya isn't going to be as difficult for Kun as people may think.
You might just wanna remove Xizor from this completely, I like him but even he has no chance against Kun(which is gonna be shown when Aurbere shows up). Traya? A different story.
Basically, Exar Kun wins. Will expand in another post.