I'm not convinced of his purity. His color is clearly mixed. His leg and foot feathering seems scant. The black skin, 5 toes, feathered shanks and top knot are all dominant traits and will show up in most silkie mixes, especially from offspring including one full blooded silkie parent. Silkied feathering is a recessive trait which can be carried. If 2 parent birds carrying the silkie trait should breed, you can get offspring of mixed coloring with silkie feathers that can appear to be full blooded.