Harbaugh took over a talent laden roster. For whatever reasons Michigan is an easier place to recruit to. Then you add in that Michigan has been in the top 10 of recruiting rankings almost every year Harbaugh has been there. All he has needed was a QB and he finally has one. It's just indicative of how important ONE GUY is to your team and how hard it is to identify the high school QB who can be THAT guy.
Frost took over a team that had won 19 games the prior 3 years and Harbaugh a team that had won 20