That is total bullshit on the you have them or you don't.When I train, I train them 3 - 4 times a week four different exercises.
Very decent especially for a brother...
That's some what true though, look at Dexter and Johnnie Jackson. I do, however, agree that if you have weak calves you can bring them up to a point, but it is purely genetics like Cutler, Flex Lewis, Paul Dillet, etc..
That being said, calves have always been a strong point for me. I train them hard, 3 times a week. Quads, on the other hand, I am working on bringing up to match my upper body.