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Ah, that is the key to your questions. Your 'breeder' doesn't know what he/she is talking about if they are trying to breed SLs to get SLs.
SLs are a one-time cross of two purebred birds. It's a manipulation of genetics that does not carry through down the line if bred agian. When you breed a SL to an SL, you get a whooooole lot of mixed genetic hodgepodge that is unpredictable, and the colors will not at all be sex-linked.
I would recommend to never get sex-links anywhere but a hatchery, because it's their specialty, and a lot of 'breeders' don't understand that they are not working with a breed, but rather a one time hybrid.
I'm sorry that this happened to you. He's a beautiful bird, but he is officially a mutt with unpredictable genetics. I wouldn't recommend trying to breed him anyway though, because his deformity can be inherited and lethal within several generations.
Don't buy from that guy/girl again, they're uneducated and producing lethal genes in their lines.