Just because Jacoby isn't hitting for these guys doesn't mean he can't be held accountable for his job performance. I can't claim to know exactly what a hitting coaches job is, but I imagine it is largely to discuss hitting approach and identify and correct bad habits that the hitters get into.
Here are some plausible scenarios with respect to Jacoby and the team's hitting:
- last year's success has caused him to take a more hands off approach resulting in less analysis of hitting approach
- last year's success has caused some hitters to expect the results to just "turn around", without possibly examining what the core issue are that have led to these struggles
Regardless of the talent level of the player, everybody is capable of developing bad habits, and/or capable of feeling the pressure of struggling and trying too hard, thus abandoning the optimal approach at the plate based on the scenario. I believe it is at these times that a hitting coach can prove their worth.
These are human beings playing in the grind of a 162 game schedule. For some to say that a batter's struggles is entirely on them, and that they can't benefit from a proper diagnosis from a competent hitting coach's set of eyes doesn't hold water with me.
Firing Jacoby may help this team, and it may not. But to dismiss the idea outright that it can't help because "he's not the one swinging the bat", is a really lazy argument.