Offensive line injuries decimated the Cowboys as much, if not more than, Prescott being out. Zeke's overpaid and overrated, but he had nothing to work with last year. The defense is a major issue, but just staying healthy up front in this trash division should net them 8-9 wins.
As far as the other teams, mediocre to bad quarterback play could be a theme next year as Hurts, Daniel Jones, and Fitzpatrick look to be the other starters. Sure, Hurts could surprise and Jones may make a jump, but I'd err on the side of that not happening.
Using Vegas win totals is a little flawed with Dallas, because money follows the Boys, so their lines usually have a tiny bit of built in inflation. That being said, the odds I checked
here are about how I would expect the division to shake out with Dallas and WFT competing and the Giants and Eagles in the toilet. It's telling that every single other division is represented (NFC West twice even) in the projections before the Cowboys.