Of course the track is favorable to the car with the most power (unless the track is very tight and twisty and almost auto-crossy. Throttle Houses track is super tight in this regard). Most ‘real’ tracks (I’m a race driver and mostly race on the east coast with SCCA and NASA and VRG, at tracks like Watkins Glen, VIR, Summit Point, Lime Rock, NJMP, Road Atlanta, Mid Ohio, Pocono, Sebring etc). Tracks that have longer straights and more higher speed turns will of course favor more engine power (and more aero downforce). It’s always been like that. Look at how the Z06/Z07 absolutely crushed the other cars in that completion (I couldn’t believe how bad it crushed the GT4RS!!!!).
the best the GRC had to offer was used (the Morizo) and the FL5 was faster. That’s (to me) no surprise. On the bigger faster ‘real’ racetracks the CTR is gonna out do the GRC. especially the Core and Circuit, which are heavier with lower engine tune and taller gears and softer suspensions. It’s just physics.
where the GRCs will have a better chance will be tight twisty small tracks and autox with lots of 2nd gear sharp turns and less straights. This is where having awd will be a plus instead of a hindrance and I bet the GRC will post much more competitive times.
(PS also if it’s raining (no matter what the course size) the awd will be a monster advantage and the GRC will shine (no matter if it’s a Core or CE or ME).