I also see saddle feathers on #3. Sure is pretty!!! I think that #1 is a boy and that #'s 2 and 4 are girls. I hope roos are allowed where you live so you can keep #3!
Maybe you should get a closeup of them. From this angle they look rounded, and a cockerel would have pointed saddle feathers. One of my EE pullets has droopy saddle feathers similar to the ones on that bird.