As American Idol delves deeper into its ninth season, fans will start to concentrate on potential break-out artists and finalists such as Katelyn Epperly and Aaron Kelly. For now, though, the upcoming departure of Simon Cowell is still a major topic. What does Kara DioGuardi think about her fellow judge saying goodbye? "He's a huge part of the show," she said at a Golden Globes party. "He's got one of the best personalities ever on a television show... He's made the show hugely successful, and he's going to be very missed." Who might fill Cowell's seat? DioGuardi seemed stumped by that question, but doesn't believe Ryan Seacrest will pull double...