Cowboys beat both Cincinnati and Philadelphia last year. Buffalo was a juggernaut at the beginning of the season, but dropped off at the end of the year. And both the Jets and Browns are pure projections based on no measurable evidence.
The Cowboys should rank somewhere between 4th - 6th on the power ranking list. Only the Chiefs, Eagles and 49ers are clearly ahead of them. The Bengals are above the Bills, but not necessarily above the Cowboys. So, 1,2 & 3 are the Chiefs Eagles and Niners. 4-6 are the Cowboys, Bengals and Bills, in some order.
Until there is evidence to show another team is better, the worse the Cowboys should rank is 6th, and if you just go by head-to-head games from last year, the order should be 4. Cowboys, 5. Bengals, 6. Bills. There is no way the overhyped Jets should rank above the Cowboys.