This might be a *little* pessimistic. Valencia had a good defensive rookie year and a bad sophomore year; there's hope he'll revert to the mean. Casilla's fine so long as he's at second and not SS, Carroll is by all accounts competent if not amazing, and if Morneau is "foggy" he probably won't be playing at all. All of those would be improvements over last year. I think it's fair to expect average infield defense.