I'm still seeing rumors that Ross will still make a play for Harbaugh now that Harbaugh has put his name into the NFL Head coaching search. The theory is that Ross can now claim that he's not taking Harbaugh from Michigan, rather taking him from some other NFL team.
It does make sense since he loves Michigan more than Miami. However, I don't think it's some grand conspiracy that also involves Minnesota. I just think he told Harbaugh he is interested in him if he returns to the NFL but he doesn't want to hurt Michigan and maybe Harbaugh started the Minnesota stuff and Ross is now free of his blood oath to Michigan.