tires are crucial to every race car, no matter the series. it's always about tires. i don't buy that one.
i could maybe buy the 43 drivers on the track, but...
in NASCAR, you can have more cars on the track because there is more give and take with rubbing on each other. open wheel cars don't have the same luxury of being able to run in close packs and rubbing wheels. they need more space to be able to stay off each other. ask Kenny Brack what happens when two open wheel cars touch tires with each other.