Usually teams use September to allow minor leaguers to get their feet wet at the major league level. The Mets have recently been in the same boat, calling up players like Bobby Parnell, Jon Niese, and Josh Thole in previous Septembers to make their debuts. However, this season the Mets may not have as many changes to make and players to showcase.
For better or worse the Mets have spent much of this season playing with prospects in the lineup everyday. Juan Lagares has earned his place in the outfield while Zack Wheeler has held his own on the mound. Travis d’Arnaud, Matt den Dekker, and Wilmer Flores are also already playing for the big league team. The Mets know what Kirk Nieuwenhuis can do and there is not really a reason to give Zach Lutz a lengthy look as his role is covered. Tim Byrdak is an established major leaguer and Rob Carson and is also a known entity. Rubin Tejada and Mike Baxter are also already familiar faces.
The newest face will be Vic Black, recently acquired from the Pirates. The Mets also said they would add a catcher so fans will finally see Francisco Pena or Juan Centeno, who have both been in the organization for more than a few years. They could also give a look to Eric Campbell, another longtime farmhand who has played the outfield and both corner infield positions this season. Otherwise the pitching prospects close to the major leagues are mostly being shut down due to innings limits.
The Mets simply do not have many new players to call up this September. And the new faces that do join the team may not come for a little while, after the Las Vegas 51s finish their run in the playoffs.
The Mets have good young talent, a lot of it just happens to already be on the team.