Oops Ronnie "Fumble!" Hillman did it again. The Broncos are knee deep and stuck in a quandary at running back. What did Denver find out in the most important dress rehearsal of the NFL preseason in a game against St. Louis? It's open casting for a starting running back worthy of quarterback Peyton Manning's trust. If I were the legal representation for a veteran NFL street free agent I would have been leaving messages Saturday night with John Elway. In the race for starting running back only one thing is certain: It cannot be Hillman. Knowshon Moreno one of those much-maligned first-round draft choices of former coach Josh McDaniels might not be an inspirational choice to start the season opener against the Baltimore Ravens but his experience probably would allow coach John Fox the least reason to stare with apprehension at the ceiling at night.