Buehrle isn't really the mystery people make him out to be. Career ERA less than half a run less than his xFIP, and you can chalk it up to being maybe the best defensive pitcher ever. You can look at the numbers and account for Buehrle's run prevention. You can't do that for Sanchez, and after only 85 innings, there isn't really a reason to try. He keeps it up for another 500 innings and maybe you start to take a deeper look. There's no reason to expect that he will though.