a bunch of split stuff.
If you use the cuckoo roo, with those you'll get black cuckoos. They will be split to lavender for sure from him and split mottled if you did it to the mottled hen.
back breed them, you'll get lavender mottled, mottled, barred mottled, barred lavender mottled, black, cuckoo
If you used him to the silver hen you'd get black cuckoo split to lavender carrying the silver gene. Back breed those to each other and you would get a mass combo of black, barred, lavender, lavender barred, silver, lavender silver, lavender barred silver, barred silver
havent tried the silver to mottled , but should be all black first time, split to mottled, with silver wing bows. Back breeding will make all sorts of stuff,mainly black, mottled, and silver . Have a shot at silver ducking , columbian, silver millies, and mottled versions of all