The pictures are pretty small, which makes it harder for me to tell anything, but that BR in the 5th picture looks like it has an awful big comb for being only 4 weeks old - I'd guess roo, but am not positive because it's coloring doesn't look any different from the others.
My guess on the bottom picture is your wyndotte roo. That's what my Paco looked like. Only have glw hens for him though. The BR looks like the middle guy is just that a guy and the far back is ?? because of the picture...but his puffy tail feathers make me think that he is a boy too. The front BR is all hen. .02