Do you have any confirmed roosters? Because sometimes a hen will take there place if there's no roo around... That bird doesn't look like a roo to me... And my orpington rooster has no color is just head to toe buff...
Look for saddle feathers and pointed hackle feathers on the bird you suspect maybe a rooster...
Look for saddle feathers and pointed hackle feathers on the bird you suspect maybe a rooster...