Lions KR Jeremy Ross told the Detroit Free Press in December that he believes free agent Jahvid Best is done with football. Debilitated by concussions, Best was waived last July and hasn't been picked up for a look-see. "I think he told me he was going to try and do some track, get into some track workouts and maybe potentially do the track thing," Ross said of Best, a decorated high school and college sprinter. Best, 25, has not responded to media requests for interviews in recent months.