ATHENS — Tailbacks Isaiah Crowell and Ken Malcome didn't waste any time impressing coach Mark Richt in Georgia's spring scrimmage. With freshman Keith Marshall likely to push for the starting job this summer, each snap held special meaning for Crowell, the 2011 Southeastern Conference freshman of the year, and Malcome, who began the day atop the depth chart. Marshall enrolled early to Georgia, but has been sidelined since March 31 with a strained hamstring.