Not sure if this scenario is even possible. But what if UB beats Miami (after Ohio beat UB and Miami beat Ohio) and all three finish in a 3-way tie for first in the East? Who goes MACCing to face UT?
I think a three-way tie goes to MOFO. Under the tiebreaking procedures from about 15 years ago (which I think are still valid), in a three-way tie you look at how the team did against the rest of the division in those teams' order in the standings. Assuming BG finishes fourth in your scenario, Buffalo would be eliminated because they lost to the Falcons while Ohio and MOFO beat them. Then MOFO would win the head-to-head vs Ohio.