The last time Richard Marshall surfaced in the Dolphins’ locker room, he had recently shed crutches. And although Marshall acknowledged then that the back injury that claimed much of his season still hampered him, he remained hopeful he could return in 2012. That was in late October. Since then, the one-time starting cornerback has undergone surgery to fix two ruptured disks, been placed on injured reserve, and allowed to do little rehab...
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