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That, in general, the SAFR principles apply in a certain way between two mismatched (or flawed) teams and in a different way between two well-matched and unflawed teams...
Concept of critical mass applies: CF defense doesn't decide a baseball game, unless you've got Prince Fielder out there, in which case it decides most the games...
But many other factors apply too, to create the sudden emphasis on run in the NFL playoffs, we're sure...