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No matter how much you may want to blame the offensive line for Chris Johnson's performance this season, there's no question that a large part of the trouble is Johnson himself. When you're making $13 million a year and averaging 1.1 yards per carry, something is wrong.
Other running backs have done more with just as bad an offensive line, and none of them are getting paid what Johnson is. With that in mind, I think Johnson will likely be cut at the end of the season (there's a bold prediction for you), and so the Titans will need a new running back to replace him.
They may try a running back by committee approach with Javon Ringer, Jamie Harper and Darius Reynaud, but since there's a very talented class of running backs coming up, I think they'd do better to pick up another runner in the draft.
Joseph Randle is the top back I see being available when the Titans are picking in Round 3. So far, Randle is three for three in 100-yard games this season, rushing for 335 total yards in three games.
He's also got good size, standing 6'1" tall and weighing in at 200 lbs. Against Arizona, he also showed that he can catch, hauling in eight receptions for 70 yards.
Rotating Randle in with Ringer and Harper will give them a good enough group of rushers to force opponents to respect the run again.