Someone else here already posed this solution, which I thought was an option.
Let the two teams who were tied both potentially advance, and whichever scores the most this week, is the team who advanced and played then is compaed to the 3rd team in the mix to see who gets to advance to the finals.
Problem with that is that the 3rd untied team must defeat two teams for them to advance.
2011 FFB Totals
Terrible at everything, and a liar.