This 10 week old columbian wyandotte has been very late to feather and it appears that anywhere white feathers should be, there is just grey down. The black feathers are fine. This chick is as big as the others of the same hatch date, eats well , is not picked on and if anything is a bit of a bully. He/she does not seem ill in any way, just strange looking. Was bought as a pullet from MPC. do you think the feathers will come in?