Simon Cowell has added to the rumours about him leaving “American Idol” after his contract ends next year. He now says that he might not want to be on the show if it loses the # 1 spot in the ratings. “Being No. 1 is verging on an obsession with me,” he says. “I don’t want to be no. 2.” Maybe it’s a warning to the three other judges: if they lose Simon, it’s because the slipping ratings were everybody’s fault except his.