Well, clearly, they do need to be taught. And they can be.Some here have argued that these things should not have to be taught at the major league level. Ideally they may be right. . .
. . .and as I look at this roster (because the bulk of this team will be back) I have concerns that we are having many of the same discussions next year.
And as to the last line, I agree. Coaching is something of a black box. We know the coaches work with various players, and we've seen players improve. Dave Bush has a mixed record, but as pitching is so volatile, I think it's probably a good sign that he's seemed to find some diamonds in the rough over the years. I'm less sanguine on the hitting coaches, though there have been some good results this year.
That being said, I kind of hope they clean house early in the winter. Get a new suite of coaches/manager and use the time before opening day (whether or not that's spring training alone) to attempt to shore up the individual and collective short-comings. Sometimes you just need a different voice in there. This appears to be one of those times, because either the message or the messenger or the environment isn't clicking.
I think they also need to make a push in the minors to address these sort of fundamental things with the up-and-coming players. I know they work on specific skills, so perhaps they're doing so already - I really don't know.