9-7 may not get Cincy in, but Sean Salisbury presented his most likely scenario on ESPN the other night, and he believes the 6th spot actually will go to a 9-7 team. He thinks Denver, Baltimore, and Jacksonville will all be tied at 9-7, with the tiebreaker going to JAX.
He thinks Cincy will go 2-2 down the stretch and finish 8-8. If they manage to finish 9-7, however, they might have a shot, but I think they would lose the tiebreaker. That doesn't mean the other teams won't all finish 8-8, though.
In any case, 9-7 might very likely get you in, just probably not for Cincy or Buffalo (and others depending on who is tied).