I share your concerns regarding the receiving corps. I'm afraid our offense is going to be very mediocre this year. DG seems like a special talent, and our tackles are obviously great. But with our uncertainty on the interior line and receiver (and let's be honest, based on last year, RB and TE have a lot to prove), I expect a lot of third and long situations and three-and-outs this season.
The nutty Michigan coverage isn't so much about Harbaugh as it is a signal to the Big Ten that Fox wants to party.