Matt Reynolds is a unique case: what other prospect can say they have postseason experience? In the 2015 season, Reynolds was called up from Triple-A to the Mets during the during the NLDS in place of an injured Ruben Tejada. However, he was taken off the roster for the World Series and did not make a playoff appearance.
He has the versatility to do it all, playing shortstop, second base, third base, and left field. The 2012 draft pick has played 5 seasons in the Minors so far, averaging a solid .343. He's definitely not a power hitter, but notched 217 RBIs and 22 home runs.
His fielding percentage has been consistently high in the Minors, cultivating an impressive .963.
Overall, having Reynolds in the Minors is a safety net. It allows the Mets to have the comfort of knowing they have a versatile athlete who can play virtually any position, should an injury occur (flashback to replacing David Wright). He's a valuable asset to have late in the season when injuries are bound to happen.