Yesterday in Suwanee, Georgia, third-year running back Gartrell Johnson took first-team reps for the Atlanta Falcons while Michael Turner rehabs from groin surgery. Johnson, a 5’10, 218-lb. runner from Colorado State was my eighth-ranked RB in the 2009 Rookie Scouting Portfolio, above James Davis, Andre Brown, Mike Goodson, Devin Moore, and Jeremiah Johnson. In fact,…