Also, Sprey was fundamentally wrong about some elements for the F-16. He didn't want it to have radar, and wanted it to be mostly a gunfighter (though Sidewinders were planned from the beginning). He wanted it to be a cheap as hell daylight fighter, yet it was intended to be used primarily in Europe where bad weather is more common than any pilot would like. If the F-16 had stuck to Sprey's core principles, it wouldn't have the longevity that it has.