Were the Cardinals, the Giants or even the Marlins playing their best ball down the stretch, the Mets’ situation might not be as rosy as it currently appears. To be clear: the Mets are in sole possession of the second National League Wild Card spot because they have played superlatively in recent weeks. But they’ve also had plenty of help from their foes. In that sense, the eighth inning of Friday’s 6-4 win over the Braves was in many ways a microcosm of their last three weeks