3) The Mets need to upgrade the bench
Trading for a player like Blackmon would also help improve the bench—giving the Mets a better fourth outfielder on the roster. They really could use one more bench piece for their championship roster. Understanding Davis is an everyday DH candidate, this leaves them with Luis Guillorme, a backup catcher, and two other spots they could upgrade.
Guillorme has done a superb job this year when he gets playing time. Capable of handling every spot on the infield, the Mets can turn their attention to the outfield where they do have some depth issues.
Defensively, the Mets are set up pretty fine. They should be in the market for a slugger.
Prospect Mark Vientos could definitely serve them in this role. However, he is a lot like Davis in regards to his defensive reputation. Kole Calhoun of the Texas Rangers would be extremely affordable. The problem with him is he might not be all that much better than the other options the Mets currently have available to them.
The Mets could always turn their attention to more versatile guys such as Adam Frazier. He hasn’t played particularly well since leaving the Pittsburgh Pirates.
The team still has weeks to decide whether or not Lee or Plummer is a good bench piece for them. Smith can regain some credibility if he hits well in the minors. Even if all three showcase their talents well, every rock should be turned in hopes of finding a better option out there.