They develop slowly. My cockerel didn't show saddle feathers until 5 months. Even the breeder was unsure. With the all black plumage it's tough to see in the pic. I'd guess pullet from the pic but not 100% sure.
Mine has a great personality - he follows my dog everywhere. If the dog sniffs something on the ground he has to immediately check the same spot. He also started growing very fast right at the 5 month mark too.
As for your Liege Fighter pullets. How is their personality? I have one Liege Fighter chick that is 4 weeks old. It’s very friendly. I’ve heard that roosters of this breed can be affectionate, but are the pullets that way too? I’m hoping that mine is a female.