They didn't hand him the job. He had 99 PAs, Tom. The first handful were against brutal lefties and then he got platooned and things got more and more sporadic from there.
I'm guessing the lack of flyballs is precisely because of this adjustment they're making in Iowa.
The dude hits the ever-loving hell out of the ball and acquitted himself pretty well at 1b. He is clearly better than Mancini, and has real upside. Not playing him is stupid, full stop.