I have 12 cuckoo silkie eggs in the bator. On day 6 so far out of the 12 I see 9 developing. I bought these eggs from a breeder from ebay who got his from a BYC member now sure who it was I'd have to look it up again. He has three cuckoo hens cuckoo cock and 1 cuckoo split black pullet in this pen. He said the skin was dark to a white coloring. I plan on breeding these back to my nice blacks with great crest and foot feathering and black skin. Whats my chances of the OS from my nice blacks to these cuckoo coming out with darker skin?