Every olive egger that I bred on purpose to be an olive egger was. I used a cream legbar rooster (The opposite of you. Should have same results without the sex links) with black copper marans hens, welsumers and blue splash marans and all female offspring lay olive eggs. The ones with the...
Cuckoo marans hen. Not sure I would cross it with a cream legbar roo. That would give you olive eggers but I think it would mess up the sex link part. An Ameraucana roo would be better.