2) D.J. Stewart
Despite having a bad year in MLB, which caused him to be demoted to Triple-A, D.J. Stewart has proven to have real and timely power in MLB. In their September 1 roster expansion, the Mets could need a left-handed bat of Stewart's power as an occasional hitter or in a high-leverage situation versus right-handed pitchers.
Through about 20 games on the minor league circuit, Stewart has posted an OPS of nearly .900 thanks in large part to his power and an improvement in his recognition of the strike zone, posting an OBP of almost .450. During that span, Stewart has seen his strikeout rate decrease and his contact ability at the plate increase.
However, unlike previous seasons the Mets do not have a high need for power on offense. The team is fifth in MLB in home runs and seventh in cumulative offensive production measured through wRC+.
These arguments and Stewart's lack of defensive ability and versatility make him an unlikely player on the team, especially for a role off the bench where speed and versatility are needed to complement the team. Still, if the team decides to go the route of offensive power production, Stewart is the ideal candidate for that roster spot.