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If your cuckoo roo has the double barring gene he when crossed to a black hen will give all barred offspring, If has a single barring gene you will get about 50% cuckoo & 50% Black. You will allso about 50% frizzle chicks in both Cuckoo & Black.
Not sure about Cuckoo roo over Chocolate ? I am sure someone on her knows.
Chocolate X Chocolate - I think is 25% Black, 50% Chocolate, 25% Dun , but I am not positive this is correct.
Chocolate to Black = 50% Chocolate & 50% Black.
Right on all counts, except that chocolate (dun) x chocolate (dun) = 25% khaki, 50% chocolate (dun) and 25% black. BDK works the same way as BBS, only instead of Andalusian blue, its chocolate (dun) and instead of splash, its khaki.
Edited to include: Cuckoo applies to dun and khaki the same way it applies to Andalusian blue and splash as well.