Yes and no. Neither of them, nor Harper plus Realmuto plus Wheeler plus Did, were enough to yield a winning season, as in just one game over .500 -- that's certainly true. The reality, however, is that no position in baseball yields less repeatable season-to-season results than relief pitcher. Position players are the most reliable, until they pass 30-32. So, if you are at a trade deadline situation and want to convert some present talent into future, then trading a good relief pitcher is least likely to hurt you going forward. Neris's good and bad years were not easily predictable. As we've seen from the relief pitchers we acquired this year, forecasting pre-trade deadline to post-deadline is even very, very spotty. It's part SSS. Except for reserve position players, nobody has a smaller season sample size than relievers. Few see as large a variation in workload.
If we are going to leave GM vacant for the season, then the guy I want is Epstein.