Just a note.. He hasn't been running out ground balls. Pissed me off when I've watched the Marlins a few times this season. He doesn't run routine grounders out and with his speed you would think he could challenge some of the arms in the NL.
Whether he's not running them out because he's hurt or he's not running them out because he's a lazy SOB thats for you to decide.
As noted earlier his fantasy value has declined greatly and I agree with EK on both Pierre and Castillo. Only thing I think is that if either of them get on with two outs and their hitter falls behind in the count, I think they should run them both. If they get thrown out you start the next inning over with your best hitters having another AB, if he doesn't then he's in scoring position with a better chance to drive him home.