They have hinted multiple times it is one of the DTs at Michigan. Bobby in one of the OTF videos was addressing the Michigan fans that their alumni/donors, much like the the Bama ones, were used to the Harbaugh discount. Now that he is gone, they will need to pony up more money to keep these guys and he said “it may be too late”. They have also multiple times reference that the DT followed Sark, Ewers, and company only to quickly unfollow them when it was pretty obvious what was happening. Gerry mentioned that if the specific DT went into the portal with a no communication choice, then this was a done deal. If not, get ready for a bidding war.