Cool story bro.
Now lets discuss reality.
The Eagles didn't even lose their best Tackle. They did lose the 35 year old LT who was once a top 5 LT.
They did lose the starting MLB but had an ascending Nigel Bradford along with Kendricks(a former starter) and Corey Nelson(of Dallas) for good LB play.
They've now lost Kendricks.
RB? LOL. They lost a 3rd down back but had 2 other young 3rd down back types.
They had Ajayi, Clement, Blount, Smallwood.
Sproles is 3rd on the depth chart at best.
And they did lose a QB who was balling out but had also had 10 good games, EVER.
They replaced him with a guy who knew the system, had 30 NFL starts with a Pro Bowl and had played for the Coach for 5 of his 6 years.
Dallas by comparison lost their best defensive player, best offensive player, 2nd best offensive player and All Pro(and historically most accurate in NFL history) Kicker.
That's not mentioning Irving being out 8 games, Gregory being on year long suspension, losing Hitchens for a stretch where we had no Lee or Hitch, having Awuzie miss 6 games, Lewis miss most of camp, Scandrick missed 5 games and played with a plate in his hand.
People who claim the Eagles and Cowboys played through comparable player attrition are completely full of crud.