I don’t have a mottled chick, and don’t have much experience with faverolles, but in this pics I posted previously, the first pic I posted was of my cockerel at 4 weeks. His comb was huge already compared to my girl. Yours doesn’t seem to have much comb, or any real true black feathers. But who...
Looks just like my salmon faverolle cockerel. Here you can see him compared to a pullet when they were about that age and now a little older. It’s obvious now, but those dark feathers have him away.