Like Joe B, I don't think this is it for them at the RB position. I assume they're taking a mid-late rounder. To me, this is purely a depth type of move -- someone who can have a role in the offense, and be a leader. Even if McCoy goes down, I don't see Gore being and every-down type back. I think they'd rotate him with someone else.
Separate note, but somewhat related... but do we have a well-respected leader on this offense besides McCoy? I'm trying to think through it, but he's the only one I can think of.