If the OE Eggs are from a Blue Shell Cock bird over marans Hens, then the dry method is best for them. If the Hens are Ameraucana or EE then it would not matter too much.I wasnt really thinking about telling them apart, but you are right! The Mottled Ameraucana could look like the OE. I will definitley need to keep them separated. I take you don't think the humidity will make a differnce though. They should all do equally well with the dry method?
The Broody will of course keep the eggs at the best humidity.
