2 out of the 3 that hatched are the nn with the bib's. The 3rd one has a fully feathered neck.
I'm not sure what color that your boy will end up being, as the parents I have were still young when I got them, and they were hatched from a pen of all colors of nn's and such over at @cactusrota I don't think that it will really show what color he will actually be until his adult feather's come in. Most white color's of chicken's will be carrying another color gene under the white from my understanding.
I'm curious to see how he's going to turn out. He has saddle feathers in and his tail is growing in too. He looks like a chicken now
