It is obvious that one thing this coaching staff has always done - if you mess up, you are going to get called out for it. Privately, and sometimes it might leak and go more public. Players are told directly (maybe too directly) why they aren't seeing the field at any given point in time.
Some players are going to take that and go elsewhere (Padron, Dieter), and others are going to work their butts off to get back in the good graces of the staff and will earn the coaching staff's loyalty forever (Reed, Sanders).
That, of course, assumes that there is a disconnect with him and the staff, and it is not just about getting close to home. I certainly wouldn't doubt if June said "he is a freshman and doesn't quite get it yet. If he gets it, he will see the field" if someone asked him about Dieter, because June says that about pretty much every single freshman you ask him a question about. He would probably give the same answer for a punter

For what it is worth, I thought Dieter was a really nice kid when I met him out on the practice field. He certainly has great hands and great size, and I hope he does well wherever he ends up.