There is no way one player on the O-Line makes that much of a difference, I know the center is the QB of the O-Line but no way in hell it makes that dramatic of a difference, especially since the Eagles lost 2 starters on the O-Line.
Re-watch the game. Watch the interior pressure blowing up everything for the Saints offense. Look at Carr's interception. Look at where the pressure is.
Patrick and Udoh caused an entire collapse in scheme. It was horrifying how much of a dropoff it was from McCoy.