I'd say it depends on your risk tolerance. I personally wouldn't give expensive breeding project eggs to an unproven broody, but I might with one I know and trust. So much less work all around, plus the hen gets to live out her natural instincts and hone her skills! ❤️
I'm no good at guessing (so please don't take me seriously); I agree on black and I'd also guess purple is a boy. Tiny bit suspicious of blue as well.
They are just beautiful ❤️