AMEN! Stupid Aero discussion...
GFR had an average laptime difference of 5.5 seconds in endurance at FSG, and almost 3 seconds in autocross. I am pretty confident that when you removed the wings from that car and let them do some setup changes and driver training for a week or so, they would still be fastest, albeit with a smaller difference. Consequently, I truly believe that the huge performance gap between top and not-so-top teams is not a single feature on the car but the overall concept and how good the team understands this concept.