We won't know anything about the tie breaker with GB (if it even comes to that) until many more NFC games have been played by both teams. We're just getting to the halfway point of the season Sunday.
We're talking about controlling destiny at this point. If the Packers were to lose this week, then we would be in the driver's seat. If they win, then sure it would be unclear. I'm not entirely sure if the Packers loss was to an AFC or NFC team because if the Saints and Packers tied, I think the Packers would have the edge in a head to head tiebreaker scenario.
Of course, a lot can happen between now and the end of the season, but it's a good fun discussion regardless.