I agree, that one definitely seems to have barring.
Who did you say his mother was?
Edit: I thought you were saying the chicks don't have blue, and I got busy pointing out that they did too have blue. Now I realize, you meant the Smokey Pearl hens do not have blue. If the Smokey Pearl hens do not have blue, that is a pretty good reason they cannot be the mothers of blue chicks, when the father does not have blue either.
If you got quite a few of them from the Cookies & Cream rooster with the Blue Cochin hen, and you definitely noticed this pattern (barred sons and not-barred daughters), I think the mother must have barring. That would either mean your Blue Cochin hen has barring that you hadn't noticed, or it would mean you mixed up which hen laid the eggs for the entire batch. Neither one sounds very likely, but I don't see any other way to get sex-linked chicks where the males show barring and the females do not.