Stop looking at the order of the games and just look at the matchups.
Dallas gained a game on Philly with the Jets, but we (almost certainly) lost it back with the Cardinals.
If the Chiefs beat Philly tonight, that puts us one up (we beat the Chargers).
If the 49ers beat Philly, that keeps us one up.
Obviously, we have to beat them when they come to Dallas.
Then it comes down to BUF, MIA, SEA and DET. We just have to play them even over those games (and not fall on our faces against WAS). Doesn't help that the Eagles already won two of them, obviously.
The problem is that they probably win the tiebreaker, so we have to beat them outright, which is out of the Cowboys' control. If the Eagles beat SF and/or KC, well, they'll win the division and they'll deserve it.