Place your bets, mini roos-to-be or mini hens-to-be? 😁 An example of feather theory?

Using feather theory, I'm guessing we've got two males and a female (female in the middle). The one I think could be female has significantly more developed feathers on wings and tail, despite being the littlest. I have found it hard to determine differences in shape of wing feathers though. The two smallest chicks are both f2 hybrid olive eggers and the bigger chick on the right is a silverudd s/marans cross. They were all born on the same day, and are currently 10 days old.

Love to hear thoughts from those of you who are seasoned chick breeders, this is our first (but not last!) hatch. Thanks everyone!