RedBanks, yes down color does not determine final grays, creams, golds, etc. But it does seem to predict amount of excess red pretty well. Any red/cinnamon across the head, shoulders and back is a pretty accurate prediction of lots of autosomal red. My cockerels with no red down still develop chestnut shoulders barred with cream, but any chicks with red down have ended up in the middle or closer to the Gold Crele Variety in coloring. You may find over time that certain chicks develop attributes you prefer.
Wow, your light cockerel certainly shows king of the roost attitude already, doesn't he? They're so cute!