Yokohamas are supposed to molt regularly. They have really thin, fast growing feathers and a whole lot of them. The tail points straight back, until it falls to the ground. Saddles drag the ground. If the saddles do not drag, it is not a breeder. Yokohamas are actually just a color variety of Minohiki, and the word "minohiki" literally means "saddle dragger"
RSY carry a very many genes, which make them complicated to breed.
They have dominant white, mahogany, they are silver, two copies of andalusian blue, spangling and mottling if I am not mistaken, then the long tail and long saddle complexes, clean red lobes, small wattles, yellow skin.
The whites are the same, just additionally carrying two copies of recessive white.