Noticed the Mohawk, and wondered if it was just untidy feathers or not, Brahamas, Croads, and lots of others have light leg feathers also Silkies of course, who are also noted for their top-knot.
I think slow growth usually means v. large birds, but the Transylvanian naked necks I had were huge at 4 - 6 weeks, and still growing like mad, so not necessarily always so. I still think they are two dear little cuckoo whatevers!!