Jeff is correct.
You want to keep the white/cream/buff chicks and use them in your next cross. These are gong to be silver columbian or buff columbian or barred silver columbian (delaware) or barred buff columbian ( rhodbar). When they get to be sexually mature adults, then determine how to proceed with the next cross. You do not need the gray or black chicks.
I have made delaware in the past. While doing my work, the chicks that have he brightest white down were silver but not always. You want your chicks to be a bright white color.
It is very simple- keep the lighter chicks and give away the black or gray chicks.
Go ahead and hatch more chicks with the light down color- if you have enough silver wheaten adults to choose from-you can look at other factors- egg laying ability, growth rate etc.
Tim
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