If he's a 3-4 win player, sure. But if he's not, then it starts to matter a bit how he gets there. We've had a lot of interesting success with the combination of strong defensive infielders, bumping up incoming pitchers' GB rates, and a manager who is a specialist in defensive shifting. If Castro isn't just crapping awesome all over the field, then it's a lot more difficult to live with his lack of contribution to that effort.