Here's the Eagles wins-losses from this season. It's not like Wentz had been putting up 30 points every game in the Eagles losses and then the Defense for the Eagles looses the game. The most the Eagles have scored this season was 34 points against the Giants and since you want to take out Dak's clutch moments against teams with a losing record, then I guess this 34 point game from Wentz against the Giants isn't worth much. Not like Wentz is pulling a Brees this season and putting up 30-40 points in every game. Most games for the Eagles this season, have been in the 20 point range or lower.
Looking up the Eagles 2018 Games and their D may not have shut down opposing offenses, but kept the score respectable, outside of the game with the Saints. Making out Philly's D to be so bad this season, when they kept the scores respectable enough for Wentz the 4 games Philly did win so far this season. Going back to actually look at the games Philly won and I see how their Defense held the opposing O to under 20 points in each of the Eagles win. So, I'm not sure where this notion that Philly has had an awful defense comes from.
Wentz isn't the juggarnot some make him out to be if he can only win games where Philly's D holds the other team to 20 or less points. This season, Philly isn't putting up a ton of points on Offense every game. So, blaming Philly's D for the Eagles losses, when if anything they contributed to Philly winning the 4 games they did and besides the Saints game, even in their losses Philly's D has held opposing offenses to in the twenty point range.
https://www.google.com/search?q=eag...me&ie=UTF-8#sie=t;/m/05tg3;6;/m/059yj;mt;fp;1
Looking here at the games the Cowboys won and it's not like Wentz has an light years advantage over Dak this season, when it comes to points scored per game. Including against the Jags who both teams played and the Cowboys score more points than Philly did on them.
https://www.google.com/search?rlz=1...vi4pMeFxqk8#sie=t;/m/02896;6;/m/059yj;mt;fp;1