I am wondering if RR can help himself before his meeting with Brandon by making some executive decisions as the Head Coach. Until announced differently, he is still in charge of football operations. If I was RR I would fire GERG today, immediately after the game or when the team arrives home tonight. Show Brandon that you are still in charge. Also, have a list of names to present as replacements. I would make some difficult decisions with assistant defensive coaches as well and any special teams coach/kicking coach. Take the bull by the horns and lead by example. Haters are gonna hate, but it sure makes it harder for them when they can see you're doing everything you can to try to get better.
FWIW. Michigan doesn't seem inclined to get re-involved.