Davis' peripherals largely look the same and where things deviate from his 2015 and 2013 performances, they also do not match his struggles in 2014. It is difficult to find a theme, except for his performance per trip up to the plate against the starting pitcher.
1st PA, SP
2nd PA, SP
There is a peculiar pattern where in 2014 and 2016, he has experienced particular trouble his first time to the plate. As many of you know, there is a general rule that with each time a batter sees a pitcher during a game that his performance improves. This particularly seems true for the third time the batter faces the pitcher. However, that increase for the American League is 741, 753, and 798. Those 2014 and 2016 seasons seem to really jump out.
Another general thought is that designated hitters and pinch hitters suffer a penalty from sitting on the bench. This has been proven across populations, but there do seem to be some hitters who defy this penalty. It makes me wonder if Davis may be experiencing something similar at the front end of a game. Some think him not getting an allowance to take his prescription for some form of attention deficit disorder may have contributed to his poor 2014 season. If so, on a limb, maybe his disposition is one where he has trouble locking into a game situation similar to most designated hitters and pinch hitters. Maybe he needs a couple innings to focus.
It might be that with this disposition, he might be susceptible to lacking confidance in that first at bat due to his overall struggles this year. Maybe things are snowballing. I have no clue. Hopefully, things right themselves and he begins to snowball in the right direction for the club's fortunes.