the only stupid question is the one that is never asked!
I am not an expert, I hope someone who knows it will give you the answer.
I plan to breed bcm roo with different breeds. but I will hatch the eggs separately (marans eggs will be pure, blue/green eggs will be oe, NN's eggs will be dark layer NNs, etc).
Ameraucanas, not Easter Eggers, make olive eggers. EEs can have a blue and brown gene, so mating them to a brown egg layer can produce offspring that lay brown eggs. I have EE hens with an EE rooster, and about 20% of those offspring will lay light brown eggs, because the rooster and at least one of the hens are carrying blue and brown or white genes You need the double blue of an Ameraucana against the dark brown of the BCM to make olive eggers