"When breeding and hatching Turken only about 90% come naked necked and 10% come with feathers on their neck. We only ship you the naked neck chicks, however they will also have offspring if bred pure that will be 10% feather necked." from the website.
https://www.cacklehatchery.com/turkens-naked-necks.html
Ok, now I understand what you are saying. I was getting some of the fully feathered neck chick's before when I was still using the white NN rooster over the hen's. I'm using a different roo now, and the chick's that hatched from my last batch from my flock all had the naked neck's, and none had the fully feathered necks. Now I just need to work toward's the cleaner looking neck's on future chick's.