I would not keep any birds with crooked toes to breed. i have two growing out with crooked toes that will be butchered..1 girl 1 boy.
The blue comes with age...some appear darker earlier.
The roosters appear quicker with combs and waddles.
Ill take some photos of my grow out for you.
Right now they are on high protein crumbles, tons of greens we put in their pen everyday and fresh goats milk soaked scratch. Plus from time to time leftovers..although my usual...