There is dominance among most chickens, it differs in degrees, if its too strong they are a candidate for the stew pot, temperament has one of the highest coefficients in genetics that there is. Bad temperament breeds bad temperament.
Something I noticed on the farm long before grad school.
It makes a big difference where Wyandottes come from, commercial production hatcherys, or Heritage Breeders. Some call themselves Heritage Breeders, Pauls Poultry was mentioned earlier, those interested might want to just post a question as to the veridity of their Wyandottes, some of which he admits were from a production hatchery, and recent outcrosses to other breeds. Just food for thought. Worth looking into if you'd like to know about the various Heritage breeders. Sandhill and Duane Urch are hatcherys, with Heritage Chickens.
Ask either of them about SCs among Wyandottes. Theirs by btw, are RC and donot produce SC. Period. There is a Lady here, Mrs Turbo who has excellent Wyandottes, check out her website, no SCs there. I could go on but its getting late and I dont want to belabor the point, folks have to make their own decisions, once they get the needed information. Their choices then are their choice, single combs can make fine layers in a home flock, they just wont make it in a Wyandotte class at a show for a major fault.
Jake