Pierre is closing the gap, but he's still got a ways to go. He's #21 in VORP of all centerfielders. Corey is #14. And Juan has a lot more at-bats than some of the people that trail him in that statistic. We wouldn't have had to give up Nolasco and two other pitchers to have Corey in CF this year, too. Nolasco's VORP trails only Z, Eyre, and Howry. And Corey is about $3 million cheaper than Pierre. IMO, Pierre has to outproduce Corey convincingly for the trade not to be a total disaster.