I watched the Giants-Jags game and I don't have a good feeling about the Cowboys-Giants. The Giants have great WRs, a real threat at RB and a QB who can throw a very accurate pass if given time. They also have an offensive scheme that is designed for the personnel they have. Their OL is not very good and I expect both Lawrence and Taco/Gregory(if he plays) to get pressure on Manning. But the Giants know this is a problem so they run plays where Manning gets rid of it quickly. This works because his receivers are open quickly. We know OBJ can take a short pass to the house and he can go deep too. To give Manning time for the deep passing they will roll the pocket - something Dallas should do with Dak.
On defense the Giants have two excellent corners and an excellent safety to can play the pass and run. Given the quality of their CBs, I expect he will be up close to the line to stop Zeke. The Giants use a 3-4 defense this year and they are pretty good at it already. The linebackers are not as good as Carolina's but they are pretty good. They have an excellent nose tackle playing against the Cowboys biggest weakness on the offensive line. Dak will need to be ready to move again. I think the Cowboys will be able to run some on the ground, but they always seem to struggle with 3-4 defenses. I don't see Dak having a big week throwing the football. I can see the Giants picking Dak off 2 or 3 times if Dallas gives up on the run early again.
I think the Giants will expose the Cowboys safeties and score some points. I think they will expose the defense, which allows RBs to get open underneath, with Barkley for some big plays. Think Todd Gurley.
On the other hand, I don't see the Cowboys scoring many points if Dak is as off target as he was against Carolina. In fact, based on what I saw in preseason and in game one, unless the Cowboys come up with plays to buy Dak some time to try some deep balls, I can see Dallas struggling to score again. The Jags biggest play from scrimmage was a run by Blake Borttles. Other than that, they didn't do much on offense and scored 7 of their 20 points on a tipped ball pick 6.