I imagine the reason is that the "California Grey" is a cross breed.
In order to create a California Grey, a Barred Plymouth Rock rooster is bred to a White Leghorn hen. This produces "Sex Link" chicks which can visually be sexed (autosexed) by color on hatching.
Due to the difference in color genetics carried by each breed, the California Grey can only be produced by breeding 2 breeds together - cross breeding.
Breeding a male California Grey to a female California Grey does not produce the same result.
In order for a breed to be recognized by the American Poultry Association, or any other association in the world, there must be extensive record keeping. There must be proof that specific traits, which would differentiate the breed from other breeds, especially the breeds used to create the new breed, are stable and can be reproduced consistently through generations.
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