Again, losing Kang just ruined our offense. We win the division if we got Cespedes for the stretch run - reminds me of a younger better Marlon Byrd. We needed a bat like that - our guys are way too inconsistent, too streaky and they aren't clutch. At the time Polanco was really struggling - Cespedes would have been the difference maker, a bat like that - wow.
As good as Cespedes was, be careful to overstate his contributions to the Mets too much. The media hyped him up because creating storylines and narratives is what they do, but there was a lot more that went on than just Cespedes.
They got d'Arnaud back and healthy around that same time, Conforto got called up and played regularly, then they had the random hot streaks from Wilmer Flores and Curtis Granderson. All of those guys raked, along with Cespedes. He didn't turn them around by himself.
Also don't forget he wasn't really even that hot of a commodity. The Mets initially traded for Carlos Gomez, the perceived best OF available, but their owner vetoed the deal due to the dollars he would be owed over the years. Hindsight is a killer in baseball, there's a lot of 2nd guessing and confirmation bias, and that's just not constructive in such a streaky sport.
It's always important to remember that trade deadline moves are a crapshoot, with very little predictability and -- honestly -- very little expected value added to a team's actual production. One player is just too small of a contributor to a team's wins and losses. And, let's not forget that Gregory Polanco was unconsciously hot himself for most of the 2nd half. I'm not sure the upgrade would have been THAT stark.
It's similar to Byrd with the Pirates. He was fine, but his production was also a total aberration -- a product of a fluky career year he's never come close to matching -- and in addition to the usual suspects, Jose Tabata somehow managed to be extremely good for 2 months as well alongside him (remember, Marte missed a lot of time). One guy never, ever, ever, ever, ever explains one team's successes/failures on his own. Just look at Bryce Harper and Mike Trout's teams this year.