Part of advanced stats is not putting too much weight on small samples. Wentz's 2016-2019 still outweighs his 2020 or Hurts' four games, especially considering the concussion.
And another part is not putting too much weight on small differences, regardless of whether you're looking at the stats where Hurts was better or worse. Maybe Hurts will be the better QB this season, I sure hope so, but Wentz didn't get traded because Hurts beat him out per se, he got traded because both he and the Eagles did a terrible job with the whole thing.
For me it's always about the GM and ownership, and even the GM doesn't matter if ownership isn't great. The Phillies have proven that for the last three years, we'll see if that changes this time around. What I found convincing about Murphy's column is that if the Eagles don't get lucky with Foles and the caliber of oppostion they faced in the NFC, we're probably not talking about any of this, because w/o that Super Bowl either the Eagles would have already cleaned house or Wentz wouldn't have wound up having the issues he did. Now he gets to play somewhere where he doesn't have to see a statue to remind him of his worst injury and diminished status with both the team and the fans.