Here, I'll help. Longoria and Cabrera aren't going to be playing 3B at the same time, right? I don't think either of them will move to a harder defensive position, right? So where are they playing? 1B or DH? Fine and dandy but now you've got a Prince Fielder problem. No matter either way because your beloved WAR downgrades players for moving down the fielding tree. Therefore, it stands to reason, that Cabrera as a DH is less valuable.