Respek
I think you summed it up well.
Light cars with good suspension/chassis and tyres will always have the advantage over heavy-ish cars like GT-Rs as far as ultimate cornering speed goes, and like you said, he probably doesn't arrive there with quite as much speed anyway, and being light, the brakes have an easier time into turn 1, too.
Prolly explains why Fatz could manage a 1:29 in an atmo RB30 Silvia, and I only went 2 seconds better.