Looking closer at the 2012 Orioles, these are the FIP numbers of ten of their relievers: 1.89, 2.32, 2.79, 2.96, 3.25, 3.26, 3.45, 3.48, 3.59, 3.67. These are the ERA numbers: 1.10, 1.35, 2.28, 2.31, 2.43, 2.44, 2.49, 2.64, 2.79, 3.71. They went with Saunders who had a nearly identical FIP/ERA at 4.07 and 4.08. They did wind up winning, but I think this shows when the bullpen first strategy could be deployed.