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Yes, that’s basically it. If you want more variation, I would breed the rooster’s daughters back to him or breed his offspring to each other.

No, since the EE father could have one or two copies of the blue egg shell gene; or even no copies at all. If all his offspring lay green/olive eggs then he probably does have two copies, and you would be able to predict that all of his offspring from future hatches will probably lay green/olive...

Crossing two breeds doesn’t result in a recognized breed. Hatcheries will sell specific named crosses, but those aren’t recognized breeds either.