He's doing OK: 278/384/525
I think they wanted him to use more of the field and stop being so pull happy. Early in the year, I used to check to see where he was driving the ball and it seems like he was making progress, but I haven't seen a spray chart or anything.
It's a hard move for Luhnow to make, but it is a bind of his making. Ideally, it would be nice to bring Singleton up and see if he might help, but how do you bring him up? Seems like the only scenario where you try him out would be to demote a reliever, which has been a strength. The other options, that I can think of at least, are to lose Gattis or Carter somehow, but then you are all in on Singleton, which I doubt makes them comfortable.