The breeder I bought them from said they have the mottled gene, I bought the last generation from her as chicks and then hatched these out myself. Looking like there’s black mottled and blue mottled in there.
Yes, there are some Mottled birds in there. If the breeders carry Mottled, some chicks are bound to express the trait. If you only breed Mottled to Mottled, you'll only get Mottled chicks.