Agreed. My EE roo produces some lovely chicks. He's been crossed over EE, and various brown egg layers, including those that produce BSL chicks. also crossed over white egg layers. first generation produced a lot of mint green eggs. F2 generation is kicking out a few more brown eggs than I expected. So, I'm crossing in a few more EE this spring, and added a couple Am chicks last spring. My goal is to continue producing sex links, EE, and a widely varied and colorful egg basket. Having a blast doing so.And yet, genes can be tricky and not do what you think they will. I had a red hen produced by a BLRW rooster over blue Ameraucana hen. I expected green eggs-she hatched from a very nice blue egg-but she laid brown eggs. Odd stuff happens with genes when you least expect it.
Generally, if the EE lays a green or blue egg, she carries a blue egg gene, but may not pass it on. I have made that BR x EE and BR x Ameraucana cross often. All the ones I had did lay green eggs, but then, there's always the mystery that pops up from time to time.