Awesome cooperation between Joseph and Jotaro, haha. ;D But this younger D'Arby brother was indeed a tough and bizarre enemy. He even made Jotaro sweat a lot.
D'arby tried to figure out what he's trying to pull off but each win irked him more and more to the point of near-insanity. After the one thing that guarantees his victory was rendered useless, he admitted defeat and Kakyoin was saved.