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Unlike a static mechanical system that the GM produc has, where the "lockup" condition of the drivetrain components on the dyno is the same as on the road.
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Not to argue too much here, but the nissan doesnt actively bias torque laterally. Their diff essentially acts the same as gms. While we could expect some increase in bhp off a dyno from both cars actually, your talking drastic swings here. This would not (with some exceptions) be indicative of say car and drivers acceleration times.
As for tires, yes they drastically help. Though take a look at the times from road and track again and you see the car roasted once it passes a certain mph. Then we have a test by c and d where it goes light years faster. Theres no arguement the nissan has more grip off the line. The questions come in from the z06 having higher terminal velocity at the end of straights in c and ds test, the dynos showing the z06 having greater bhp, and the z06 being equal in all but a skid pad test. Is it possible for the z06 to still be significantly slower given these static tests? Yes. Is it likely? Hells no.
Edit: Straight line discussion only here folks.