Comments: Collins is the undisputed lead back, but Dixon certainly could work his way into a bigger role if he comes to training camp healthy and in shape and avoids any missteps. Allen, a quality special teams player and the team's top returning pass catcher from last year, should have a role regardless. The Ravens also are still on the lookout for a potential third-down back to bring in. Turner, Thompson and Edwards, all college free agents, will get a chance to open some eyes in the preseason. As for fullback, Ricard did fine in that role last year, but the Ravens also could use tight ends Nick Boyle and Maxx Williams as lead blockers.