Simply this is because Walter Rohrl is very used to the supercars testing and testing it; if it wasnt enough, probably he knows the Nurburgring a bit better than Kaiser, whereas a formula driving technique is another world compared to a street legal car or a supercar
For example, if there was a race between a IRC star (Anton Alen, for example), and Sebastien Loeb in a S2000, probably Anton Alen would win the race because it takes some time to get used to a car, to set up a car, and etcetera
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