I'd say 6 is a cockerel, but I'd expect more development by now. Looks like the development of a 4 week old cockerel, so may just be a super early developing pullet.
Post updated pics of that one in a few weeks.
Color on the pics is super washed out. Op, did you use the zoom on your phone cam when you took these?
I don't want to say yes or no before seeing better pics, but these two are the ones I suspect if I suspect any. I can't see that Gray's face, but that color looks male.