I knew that Cain would be the sample, and he always is in the Anti-FIP (or DIPS) argument. In the end his FIP and ERA are 0.33 apart (and this is one of the biggest examples over that much of a sample size). He has outperformed his xFIP by quite a bit. Is FIP perfect...absolutely not at all. NOW FOR THE IMPORTANT PART...are most of the people talking about Sanchez needing a change to be successful, using FIP or xFIP as their reasoning for him not being successful if his current numbers don't change. ABSOLUTELY NOT. My biggest argument is that all of the pitchers that have had a successful (or successfulish) career with a low swinging strike percentage, have a lower than average BB rate. That's just one thing. Cherry picking any one stat is a bad way to evaluate. In Sanchez's case there are several red flags, as well as some major pluses (his velocity notably) about his current repertoire.