I still think Rankin does a lot of chasing down in midfield that we'd miss if he wasn't there. He will bring experience onto the pitch. As for no legs, he's an older player who should be able to manage his game to suit.
Tend to agree with EP on this. It all went tits up after him and Fergie fell out in Nov and promises not delivered. No role at the club currently so why is he allowed to be involved in something as crucial as this?