Flex WR/RB - Warrick Dunn vs. ATL, Larry Johnson vs. SDG, or DeSean Jackson vs. CLE?

All season I've started a RB here but Dunn is losing all the goal line carries to Cadillac and L.J., although he gets all the touches at RB, hasn't been playing well and is facing an improved Chargers run defense. DeSean will get some extra points for return yards but it's not a PPR league (1pt = 10 yards rec or rush, 1pt = 25 return yards). DeSean is playing the Browns but Westbrook might have the ball the whole game...