Those are EE was the first sentence that entered my head also.. right after that's not BLRW, unless the juvenile plumage is WAY different than what I expect it to be..
The may be cross but definitely not pure.
I agree 2 & 4 appear to be cockerels, so far.
Single comb CAN pop up in pure bred rose comb birds since rose is dominant to straight and can therefore hide a copy of straight.. both parents would have to pass a copy to the offspring for it to present.
I do see some "blue" in their feather colors.. at least some of them are blue based.. but they are barnyard mix at best.. Just for discussion purposes, not actually criticizing them.