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A couple more observations from these offspring. If you got a silver cockerel, then your golden cuckoo rooster is S/s+ meaning he has one gene for silver and one gene for gold. I had a S/s+ rock roo, and he showed lots of gold, but could throw pure silver offspring when paired with a silver hen.
From the chickdown on the light cockerel, it looks like you have Wheaten and either Db or Co genes mixed in. I'm guessing Db based on the chickdown, but wheaten tends to change the chickdown too. Db restricts black, that's why your cockerel is so light. You don't really want Db in your GC flock. Wade line black coppers have Db, but it's hard to get rid of because it doesn't do anything in hens when they only have one copy Db, so it gets passed on unnoticed until offspring are created that carry two copies.
The gold on the breast of the original cockerel you posted is a bit unusual - GC should have gold in hackle, saddle, and shoulders, and if e+ based in the wing triangle. Gold in the breast is a possible indicator of wheaten, Db or Co. These may not cause issues in heterozygous form (one copy) but they will create problems when they combine in homozygous (2 copies) form, particularly if you combine the wheaten and Db or Co (your very light cockerel).
