No elemental weaknesses?! Lloyd's a definite recipe for disaster. And besides, he needs to get up close and personal with the opponent in question in order to use his sword. Or can he do long range attacks?! (almost all RPG villains or heroes with swords do). If he could do long range attacks, Kuja's going to be dead. But then again, he has his faithful Silver Nova Dragon to dodge his attacks for his master, and there's the added bonus that he'll get pummeled with Lloyd's attacks (if any). And Kuja would be definitely useless if Lloyd comes in for the kisser.
And if Kuja gets real angry he'll Trance and cast those stupidly cheap Flare Star and Ultima spells at him until Lloyd turns into toast.
And on an added note, how could Kuja Trance if he gets hit with Lloyd's obscenely cheap sword? Is Kuja wearing any kind of armor to defend himself with?