Wyandottes have Cochin ancestry so you sometimes will get a single comb, sometimes will have a few feather stubs pop up. Most folks who are "breeders" got their original stock from a hatchery and have no idea how to improve them; in other words, they are not breeders, but propagators, so you are still buying hatchery stock. Seems almost 1/4 of hatchery Wyandottes have single combs from what I've been able to tell.