Be prepared to be attacked by the baseball geniuses on here. Do you not have a response to my post about the difference in the number of caught games having an effect on catcher ERA? Yes, and that is a dispositive argument as to why CERA is completely worthless and irrelevant -- catcher's catch different pitchers and different teams. It is, however, NOT a dispositive argument in this instance. The initial post concerned one single pitcher, in one single season (month, actually). Therefore, the usual arguments against CERA have no merit. That said, I'm not sure if there is a correlation, much less a causation. I think catcher's can affect pitcher performance, albeit not significantly. Zambrano's problems go deeper than who is behind the plate -- though that person may have some sort of affect, especially if Zambrano believes it does. Actually, the argument was that if we don't believe that the catcher has an effect on pitching performance we were kidding ourselves. There is no evidence that it does, and I was pointing out that fact. Anyone can believe what they want, and that's fine, but it's certainly not so evident that anyone is "kidding themselves" to believe that it has no impact.