For eight weeks, they all look like pullets to me. I would expect a wyandotte roo to have more red by now, they tend to develop combs pretty fast. That being said, this is my first year with wyandottes, so I'm not an expert. Also, I have had pullets that would raise their hackle feathers when establishing dominance over another hen. It is a "roo" behavior, but hens can do it too, especially when pecking order is being established. I hope they are all girls for you, the waiting can be tough!