So maybe we have a reason for the dumpster fire. Sounds like Harbaugh can't say no to his buddy Drevno.  

The intro:

"It has not gone bad yet at Michigan but it could soon, multiple sources close to the program say, and the trouble points back to offensive coordinator Tim Drevno.

Jim Harbaugh has a credibility problem. He has a credibility problem with his players, his assistants and his bosses."

http://gridironnow.com/tim-drevno-major-problems-jim-harbaugh/