All should feather white.Ameraucanas are usually recessive white but there are also some dominate whites around.Dominate whites hatch yellow.Recessive whites when based on black hatch smokey.Recessive whites can also hatch white and even yellow depending what color is under the white.2 copies of recessive white can turn any color to white.Legs should darken as they get older.My guess is they are a diverse gene pool of recessive whites.Some may be based on wheaten as wheaten hatches yellow.Hope this helps.