From what I can see in your birds is that they are segregating for different genes. At the E locus you have the brown allele and birchen, some of the birds have only the columbian gene, while others have a combination of the columbian gene and the dark brown gene, they also have the pattern gene in them.
If you get the pattern gene homozygous in your birds then you can begin to get better autosomal barring.
The columbian male (overly white male) would not be a good candidate if you want to breed for secondary patterns ( the autosomal barring and lacing) in your birds. He does not carry the pattern gene needed for the secondary patterns,
Also the brown colored chick in this string carries the dark brown gene and is also birchen at the e locus. Birchen birds normally have some form of black down but birchens that carry the dark brown gene have the brown down like the chick in the photo. The amount of brown can vary from what is seen in the chick to a brown head and black body.
Edited by Wappoke - 1/2/16 at 6:19am