But when I point out that Jeff Bagwell's postseason OPS is 263 points lower than his regular season OPS, you dismiss it, because it's 'only' 129 PA's.
Well, of course, 129 PA's is the entirety of Bagwell's postseason career. That's as big as the sample will ever be. So we'll never know if the results would have continued that way.
In my opinion, we can't prove clutch hitting, but we shouldn't outright dismiss it either.