http://fivethirtyeight.com/datalab/after-signing-day-wisconsin-makes-the-best-of-its-recruits/#fn-1

One other thing that M*chigan sucks at is developing talent. Consistently in the bottom of Power 5 schools. This analysis shows how power 5 teams have fared this year and in the past decade based simply on final results compared to recruiting rankings.

Notably, The top SEC schools are also pretty bad. Either the rankings are inflated (he uses Rivals because they have been around the longest), the players are not as "coachable", or the coaches are not doing the best job of developing talent.