Didn't the eagles lose 2 guys? Which means they had to switch around their O-Line as well? McCoy isn't super man I really think this goes beyond just one guy.
It goes beyond one guy, but McCoy was vital to the Saints OL success whereas the OL the Eagles lost are good, but not the driving force of their offense. Plenty of other flaws for the Saints Offense, but the Saints lost their foundation and never recovered.
Also notice how rarely the Eagles will actually tushpush now without Kelce.