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There was a study done a few years ago that showed Lou would consistently get more out of his hitters than other managers. Statistically he was the best at this in the game.
Granted, I don't know who keeps track of this anymore and Piniella may have fallen off with age.
Get him a pitching coach he respects and I'd explore the possibility of taking him back (or someone else). I'm not exactly sure what Wak is good at anymore if he wasn't responsible for the '09s chemistry.