The Mets’ biggest misfire last offseason might have been failing to adequately stock the bullpen.

Edwin Diaz’s torn patellar tendon at the World Baseball Classic changed the dynamic completely, but even before that March night in Miami, there were legitimate questions about whether the Mets were an arm or two short in the bullpen.

David Stearns has begun his reign as president of baseball operations with the presumption Diaz will be ready for spring training, and that’s a good start in constructing next season’s bullpen.

But behind Diaz there is a gigantic void.