The managers are not what turned these teams around. Its either player acquisitions, young players improving, or a wave of prospects getting called up. Take last year's Tigers for example. Everyone says Leyland turned them around, but he was just a small part of the puzzle. Leyland had the good fortune of coming to a bad team that had made some good signings and trades and had some good prospects coming up. You can credit Leyland for the turn around, but I credit the additions of Polanco, Ordonez, Rogers, and Jones along with the promotions of Verlander, Zumaya, and Granderson and other moves.