I don't know Eichorst at all, but I think people are making a much out of this right now. Yes, we don't know too much about him, due to his style of "not being out in the open". He could be a big dork, or he could just be a quiet guy. NU had a former AD who was always outside of his office, checking in on his coaches and staff, and most people thought he was being egotistical and meddled where he didn't need to be.
Osborne was a former coach, so it was natural for him to be around the coaches at their practice, observing them. Eichorst is a business/administrative guy who prefers to let their coaches do their own thing. I agree that it's concerning if coaches can't get any meeting time with him. But, I think the "assigning" of books, could be taken out of context and the books could be more of "recommendations". Do you think it's wrong for an AD to slip a book about leadership, communication, etc. in a coach's mailbox with a note?