I'd say number 3 is a male as the spots look to be disappearing and the rusty colour taking over, but it could just be a female with funny colouring. If the rust keeps spreading then it's a boy. If you don't mind sitting and listening for awhile to your birds I have noticed the males, before they start crowing, will start to make a lower, quiet noise as compared to the girls who keep the higher pitched cheep. It kinda sound like the boys are going "Rib, rib" in a low pitched voice. If you can, take the males out and put them in a separate cage as they reveal themselves as then the less dominant males will take over and reveal themselves sooner than they otherwise would. Your darker ones look like barred rosettas - one of my favourite colours.