I don't think GB is better, I'd put them on the same tier.
And not to jinx anything, but there's no way Detroit can be the same team with all those defensive injuries. I'm guessing they'll beat the Bears next week, but I'm really curios to see how they do against a professional, even if cooked, team like San Francisco on the road. If SF is all but done, they may look at that game as their Super Bowl.
I hate that I think Philly is going to claim the #1 seed.