Echoing what @Vanimal46said, there simply aren't enough good options to rely on in the bullpen. That's not Rocco's fault. Any of them can implode at any time. I don't necessarily disagree with him relying on veterans like Pagan more, but they've proven that they can't be trusted in late game scenarios. That said, you can't trot out the same 2 guys every night and expect that to be sustainable over a 162 game season. It's just not going to happen.