Our Roo actually developed slower than the girls. They, all 15 of them, had full head of feathers and he still had the fluffs. He was larger and ran all discombobulated also. It was very obvious to me.
I'd like to get a clearer picture but they are, well, chickens. They see me coming and run around trying to hide. I had a pretty strong feeling about him and was just looking for confirmation. Thanks everyone!