Here's why Mets and free agent Gio Gonzalez are at an impasseGonzalez could be a rotation upgrade over Jason Vargas2/3/2019, 4:35 PMAug 19, 2018; Washington, DC, USA; Washington Nationals starting pitcher Gio Gonzalez (47) throws to the Miami Marlins during the second inning at Nationals Park. Mandatory Credit: Brad Mills-USA TODAY Sports / Brad Mills