Eagles rebuilt their team in 1 offseason. You could say they even lost talent on paper from last year, in a year which took them to week 6 to get the 3 wins they have now. Eagles now LEAD the league in Scoring on both sides of the ball... Good coaching changes everything. Bears don't have it.
I'm excited you are talking up my Eagles, but lets pump the breaks a bit. They faced Cleveland, Chicago and now shocked a Pitt team that was playing a road game sandwiched between two divisional games. A couple thoughts how the move would look here:
1 - They hired the OC/QB Coach/Former QB of Andy Reid to be the HC - I don't know how many players turned coordinators for Lovie Smith, but pick one of those guys and it's essentially what the Eagles did. Really weird move that was criticized heavily.
2 - They still had a 4-3 defensive roster despite running a 3-4 for the past 3 seasons - It's rare for a team to actually have many of the pieces in place to seamlessly change systems.
3 - Jim Schwartz is a top tier defensive coordinator - Typically guys like that aren't available. You can say Fangio is that good, but I'd disagree. What were his defenses without extreme talent? When he was at his best he was asking Justin Smith, Aldon Smith, Patrick Willis, NaVarro Bowman, etc... to do their thing.
4 - The start Wentz has had is starting to defy logic. Rookies aren't supposed to do what he's doing let alone guys that came from Div 2.
5 - Howie Roseman is not a common GM - I think he's traded something like 4X as much as the second closest GM. This works great when looking to purge old contracts and move on. Can it fracture the identity and leave players unsure what move is coming next? Absolutely.
Anyway, right now everything is coming up great for the Eagles. That will end soon, so it's early to say the model they are using will give long term success or can be replicated easily.