Two things we know to be true, as September threatens to turn into October:

Bullpens matter so, so much in the playoffs, more than in the regular season, and:

The bullpen you have now quite often bears little to no resemblance to the one you had in April.

Such is the life of the revolving bullpen door, where injuries, ineffectiveness and trades can mean a team cycles through dozens of relief arms each season, to the point that looking at season-long numbers holds relatively little predictive value. (Just ask your local Mariners, Cubs, Mets or Tigers fan how they feel about their relievers right now – despite relatively similar seasonal outcomes . We’re guessing you’d get some extremely varied responses.)

In that spirit, let’s look at four bullpens that might be trending into the play

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