moon, I get the CERA thing, but consider this. I'm posting this before I even re-check the numbers. I'll come back and add them.
Numbers are regular season only.
1) Houck and Whitlock have their best CERAs with him.
Houck 99 IP 1.64 ERA .528 OPSa
Whitlock 116.1 IP 2.40 ERA .623 OPSa
2) The guy he caught in Houston had a great CERA with him.
Cristian Javier 34.1 IP 1.31 ERA .388 OPSa
3) Maybe he works really well with certain pitchers. The sample size of pitchers you're using for his CERA comparisons is actually pretty small.