Chris Rock is rated a 5.7, 3 star on Rivals. He's the 23rd ranked strongside d-end. The 21st ranked is a 4 star, so he's not far off. Also, Zettel is 3rd and Beyer is 13th.
The nutty Michigan coverage isn't so much about Harbaugh as it is a signal to the Big Ten that Fox wants to party.