If that boy is a mottle (which I kind of don’t know if he is, because mottles usually have white skin and bright red combs)… but if he is, then all the babies will carry mottle and it will be noticeable in the chick down coloring but not as adults. You could easily just sell the chicks as BBS (black, blue, splash) and let people know that they carry the mottled gene as well.
Feel free to continue posting pictures of him as he matures and maybe we can figure out what is going on with him. And the other one that is hard to tell as well!
I don’t think you would be an irresponsible breeder, lots of people enjoy getting a “mixed bag” of colors with their chicks. Only those who are looking for a specific color/type/quality/etc will care. I found rather quickly that it is not too hard to find homes for chicks. Well except for this past year, the market in my area was soooo over saturated for all breeds, that it actually was more difficult. Silkies are a breed that bring people a lot of joy and I think you’ll be able to have fun with them.