Just watching Davis bat, he looks like he's thinking about what he's going to eat after the game, and not at all about how to hit a baseball.
It's not that he doesn't care, but he is a guess hitter trapped in his head.
When you lose confidence, and you are just guessing... hard to do anything effective. Also makes your reactions slower.
When he showed basic effectiveness mid-April to mid-May you could see he went up with a sounder plan. Shorter swing, better approach. More aggressive.
When he gets trapped in his head, it's just a horrible thing to watch.... Steve Sax, Knoblach, Ankiel....