Nice summary but I'd be little more precise with conclusions. I think it is quite a bit better than you present it:
6-0 - Division Crown
5-1 - Division Crown
4-2 - Wildcard lock, great chance at division even if one loss is against the Dolphins, virtual lock of division if we win against them
3-3 - Great chance at wildcard (actually almost lock), tossup for division if loss is against the Dolphins, great chance at division if we win against them
2-4 - Outside shot at wildcard, lose division
1-5 - Miss playoffs
0-6 - Miss playoffs
I also wouldn't call our chances at 2-4 as "outside", we have very reasonable chance to get there with 9-7 even if we win "wrong" games, i.e. 49ers in this scenario. But if we win "right" games, i.e. Dolphins and Pats, we have like 70%+ chance to get in (and its still tossup if Dolphins somehow win all other games).
As far as PO is concerned, we are in good shape even we are mediocre from now on (which I don't think will happen, I expect us to win 4+ games).