Funny, I was thinking the exact opposite. The Giants barely beat the Cowboys even though the Giants are pretty much a healthy team, with the exception of Barkley, while the Cowboys were missing their top 3 OTs, their top OG, their top 3 DTs, their best TE, and one of their starting LBs. Oh, and their starting QB.
Seriously, does anyone doubt that if Dak was in this game the Cowboys would have won easily. The injuries to the Cowboys were too much to overcome. When they get all their players back, assuming the stay relatively healthy, the Cowboys will have no trouble beating the Giants, and everyone else in the NFC East. When healthy, the Eagles and Cowboys are the two best teams in the division and will be next year too.