The Pirates plan on playing him full time once he is 100% healthy. Came in to the club house on Sunday with a sore sholder, so they decided to rest him. They do not want to risk a set back, so they are working him (like Nomar, Nixon, etc). Think it as spring training for him.
I will not rest until I have you holding a coke, wearing your own shoe, playing a Sega game featuring you, while singing your own song in a new commercial starring you, broadcast during a super bowl game you are winning. Show me the $$$!!!