NORMAN — The ink is dry on the 2010 signing class, but the majority of the class won’t arrive on campus until the summer.OU’s 2009 recruiting class, however, has been in Norman for almost a year now. The Oklahoman analyzes that group after one season:→QB Drew Allen: After redshirting last season, Allen will probably back up Landry Jones, while incoming freshman Blake Bell redshirts and learns …