I don't know if Klentak or Kapler is responsible for the player-by-player mediocre performances based on their own standards, or if it's just luck. As shown in many other posts, with the exception of possibly Cutch, Kingery, Harper and Realmuto, who were about where they would be expected to perform, every other regular or semi-regular performed below expectation. So we had a lot of guys doing what they were supposed to do or worse.
Contrast that with the Yankees, who got career years out of Lemahieu (from scrub to all-star), Urshela (all-star stats in a 50% role), Torres, Tauchman, and Voit, and got strong years from Judge (when healthy), Sanchez, Maybin, Gardner, Encarnacion, and Frazier. How do all these players have career years or above average years, when we barely have any players performing at their career average? Is it management? Or luck?
And they got decent years out of some bleh pitchers, too.