Things don't always regress to the mean over 162 games. There's a reason the White Sox tanked hard at the end of the season, and that's because their pitching regressed to the mean. Fortunately for them, they had built up enough of a lead to make the playoffs, and once in the playoffs it's a crapshoot. I was mainly referring to the fact that they pitched well for most of the season and that throwing 4 outstanding performances in a row, while remarkable, isn't totally out of character. Obviously they weren't 1.52 ERA good all year, but everyone knew for the Sox to have a chance the pitching would probably have to be lights out. If the White Sox beat Boston/Anaheim by getting on base at an alarming clip, that would've been a fluke. This team simply played to their strengths.