David Stearns smiling while speaking at a press conference. Robert Sabo for NY Post

LAS VEGAS — Mets pitching wasn’t supposed to fall apart like that, to drop from the best in baseball to fifth from the bottom in a flash. Really, nobody’s pitching should.

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To plummet from an MLB-leading 2.80 ERA on June 12, when the Mets looked like a World Series favorite, to a $340 million club that couldn’t outlast the plucky Cincinnati Reds from a microscopic market is practically unprecedented.

The vaunted Mets pitching lab was allegedly so good they guarded their info like gold, their old pitching coach, Jeremy Hefner, so

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