To add on to Pegasus' statement, the fact he resorted to cheating against Jonouchi as well as relying on his lackeys to help him get star chips seems like something below what'd be expected of his Champion self from what little we see of those days. This deterioration in skill also fits with his later portrayal in the anime of becoming so washed up that his only purpose after that was to be a tool for Marik who couldn't even force Yugi to rely on Atem.