Accdording to your bright ideas Wentz had a better season in 2018 with his 5-6 record than Prescott did with his 10-6 record which won the NFC East division. And then his team beat Seattle in the play-offs.
Let's look at the Eagles season together.
1. Atl:
Foles plays and posts an abysmal 50.7 rating, while the Eagles rush for a combined 113 yds. They don't score a TD.
Loss by 6
2. @ TB:
Foles with an outstanding 98.8 rating, over 300 yds, 1 td and 0 ints. But they can't rush for a score or over 100 yds.
Loss by 7
3. Ind:
Wentz gets his first start back and is solid, with an 84.9 rating, 1 td, 1 int. The ground game puts up 150+ and a td.
Win by 4
4. @ Ten:
Wentz throws 300+ yds, 2 tds, 0 ints, with an outstanding 99.4 rating. The ground game barely cracks 100 yds, 0 tds.
Loss in OT by 3
5. Min:
Wentz throws 300+ yds, 2 tds, 0 ints, with a great
115.3 rating. The ground game barely cracks 80 yds, 0 tds.
Loss by 2
6. @ Gia:
Wentz throws 278 yds, 3 tds, 0 ints with a rating of
122.2. The ground game gets 108 yds, 1 td.
Win by 21
7. Car:
Wentz throws 310 yds, 2 td, 0 ints with a rating of
119.6. The ground game gets 58 and 0 tds.
Loss by 4
8. @ Jac:
Wentz throws 286 yds, 3 td, 1 int with a rating of
119.6. The ground game gets 133 and 0 tds.
Win by 6
10. Dal:
Wentz throws for 360 yds, 2 tds and 1 int, for a
102.5 rating. The ground game gets 71 yds and 0 tds.
Loss by 7.
11. @NO:
Wentz throws for 156, 0 tds and 3 ints, for an abysmal 31.9 rating. The ground game gets 58 yds and 1 td.
Loss by 41.
12. Gia:
Wentz throws for 236 yds, 1 td and 0 ints, for a
108.6 rating. The ground game gets 127 yds and 1 td.
Win by 3
13. Was:
Wentz throws for 306 yds, 2 td and 1 int, for a 98.9 rating. The ground game gets 130 and 1 td.
Win by 15
14. @ Dal:
Wentz throws for 228, 3 tds and 0 ints, for a
120.3 rating. The ground game gets 34 yds and 0 td.
Loss by 6
15. @LA:
Foles throws for 270 yds, 0 tds and 1 int, for a 75.9 rating. The ground game gets 82 yds and 2 td.
Win by 7
16. Hou:
Foles throws for 471 yds, 4 tds and 1 int, for a 120.4 rating. The ground game gets 57 yds and 0 td.
Win by 2
17. @Was:
Foles throws for 221 yds, 2 tds and 1 int, for a 102.1 rating. The ground game gets 129 yds and 0 tds.
Win by 24
Wentz has one bad game in the entire year, against the team that should have gone to the Super Bowl. Otherwise, he's outstanding, with the difference between a win or a loss being decided by run support, which is missing from most of the games. In games where he gets a score in support he's 4-0.
His qbr is over one hundred 7 out of 11 games and right at it in 2 others.
In fact the Eagles are 3-7 in games where they fail to score a single td on offense. Wentz played in 5 of those losses.
Foles won 2 times without run support, though one of those was the last, Washington game, where his defense gave up 0 points in offense from Washington.