I think AVG may be the only spot where you're truly vulnerable, but who knows. You have a few potential mega-rebound guys on your team, also a few who were terribly unlucky and should improve on their BABIP. You should contend in steals without having to sacrifice anything.
Verlander, Oswalt, and Haren should be QS machines. That extra cat really benefits you. I think you will be shipping out on of your OF's early/mid season for any other cat you want to bump up, as I think you'll be overwhelmed with production from those spots. But shit, I don't know where you would even upgrade? Maybe some steals if you're only middle of the pack.
Overall, great team IMO.
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