I think this is all very true. Salary cap is important and we shouldn't underestimate how much of an edge we got from Hurts performing very well on a rookie contract last year. It basically allowed another star contract. Yes, the Eagles were given a harder schedule this season, but I think a bigger factor of having been to the SB last season is that other teams have spent a lot of time figuring out how to beat the Eagles. Given that, I'm stunned that even with two new coordinators that the Eagles have been so same-old, same-old on signal-calling on both D and O. It was a time to innovate. As in baseball, the pitcher adjusts to weaknesses the batter has shown and the batter either evolves to meet the challenge or fails. The Eagles have not evolved. They are trying to do the same as last year, with a little older, less talented roster. The other big surprise is that despite the same-old, same-old that the team seems so disorganized so often and that the LB/DBs are so bad at communication, or that the team seems so incapable of responding to blitzes, or that time management is a problem. They don't look like a team that has been to the super bowl.
Six of the last Eagles head coaches had winning records with the team. Many showed a steep drop after the novelty wore off. The Oregon offense was briefly successful and had opponents back on their heals. The new was figured out by other teams given an off-season. The same has now happened with the Eagles version of the RPO. By next year, the Brotherly Shove is likely illegal or other teams are stopping it at higher rate. And, to be completely honest, without the Shove, the Eagles aren't even in the playoffs this season.
We will need two new DLs for next year. Despite veteran leadership, Graham and Cox can't be back.