The Titans signed running back Shonn Greene on Wednesday, signaling a modest shift in how they're approaching running backs in 2013. The Titans' brass has said they intended to add another back to the mix with Johnson and did so with a physical inside rusher who can convert short-yardage situations. Greene figures to cut into Johnson's workload a little bit more than previous running backs have and also serves as an insurance policy just in case Johnson comes out cold like he has each of the last two seasons.
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