Panthers release Leonard

    The Panthers released defensive tackle Louis Leonard Tuesday, cutting bait on a guy who never reached expectations here.     Leonard was dogged by knee and ankle problems through the offseason, and failed to live up to the potential he showed last year. He played well in two games, with 11 tackles and a sack before breaking his ankle on the final defensive snap at Atlanta.     His departure means they have a spot on the 53-man roster, and still more questions than answers at his position.They start Derek Landri and Ed Johnson, and have Nick Hayden and undrafted rookie Andre Neblett in reserve.It also leaves them with nothing to show from the 2009 trades for him and Tank Tyler, who was released before the opener. They gave up fifth- and sixth-round picks in this year's draft to obtain them. -- Darin Gantt