I really believe you're on the right track here. Winning a World Series is hard, partly because you have to have a team capable of doing two things, a) finishing well in a very long season, and winning in short series when the approach changes. You don't face the same pitchers in the post-season, again for two reasons, a) the mediocrities don't get their innings anymore, and the stars no longer hold back in order to survive the long season; on the offense side, similar things are in play, so you might see platooning for lefty-righty reasons but not just in order to give your regulars some rest. Grover's listing of strikeout rankings for teams might change if one took the time to sift out the fifth- and sixth-starters and the long-men in the bullpen, aside from whether strikeouts tell the whole story (although they are along the right track). I have no idea how to quantify the concept, but the "piranhas" and hustle guys that the Twins ran out there to win enough games in the regular season seemed to be overmatched in the post-season. They have what it takes to compete when the opposition has AAAA and benchwarmer major leagues sprinkled through the lineup, but when the opponents in the playoffs no longer give you free outs to shorten your pitchers' innings, and no longer give you many mistake pitches, and are no longer flummoxed when you attempt to bunt for a base hit, well, if you are Boof Bonser or Jason Tyner, and the other team has beaten your one ace pitcher 3-2, what do you have left in your bag of tricks? Not too much, I'm sorry to report, you just "try real hard, get 'em tomorrow". The guys Grover listed like Freese and Renteria are a clear step up from the Jason Tyners that the Twins (to their credit, in one sense) get the most out of during the regular season but then try to succeed with in the post-season. As I said, I don't know how to quantify what defines the kind of player I'm talking about, but we recognize them when we see them: the Pedro Florimons who with a little more coaching *may* figure out how to stick the bat out there against regular-season pitching and get a few more base hits, but will revert to futility against real talent in the playoffs.