Hipsher had (most seasons) a lot of individual talent (Bosley, Ball, Andrick, Phillips, Hollingsworth, Tarver etc.). But he couldn't win.
Managing egos, keeping kids out of jail, motivating... it takes a lot more than 3-4 good basketball players to build a winning program.
To improve EMU to "mediocre" isn't too difficult. Simply get some coachable, semi-talented kids who will stick with the program for the duration. If this coach is any good, and he uses that plan, he'll have them winning 15-17 games within 3 years.
The tough part is surpassing "mediocre." Winning 20+. That's coaching.