This week Kyle Larson participated in the Indy 500 Open Test. After day one, Larson was P2 on the board in single-lap speed. Kyle Petty believes the NASCAR driver is among the rarest of race car drivers. There is an ongoing discussion about “superstars” in NASCAR, what that means, and who could be a “superstar.” Kyle Larson is on the shortlist of drivers with superstar potential. But an overall lack of transcendent talent, a driver who commands attention in pop culture, has been apparent. Talking to Eric Estepp on Out of the Groove, Petty compared Larson to two of the most naturally talented d…