You're 100% right on WRT dysplasia and breeding. Sadly dogs with 'C' hips are bred all the time with other 'C' dogs. If a breeder is responsible he'll not breed across or down but this is not the case far too often. And when HD shows up there is far to often the 'sweep it under the table'.

I've bred my F.B. (B hips) with an 'A' bitch and that is the way it ideally should be done. Also the height is not considered far too often.