Because EE's can have other breeds mixed in, especially if someone is trying to change or add an egg color, these additions can change the comb type. I don't know how many times I've thought I had a pullet until it crowed. Then I had one that looked like the last one in your row of pictures and it developed a rooster's curved feather on it's tail. Bummer! But thankfully that feather fell out, never to return, and she lays a nice large greenish blue egg almost every day.
Anymore I find the best way to sex them is when they are very young, 10 days to two weeks I watch their behavior. That's a big clue and also the color of the comb. The boys' turn a brighter color very quickly
I know several people with EE's and the following is also a big clue. I've had yellow EE chicks which can be either sex, but the chipmunk patterned babies can be either but if you have a speckled one or a broken chipmunk patterned one, you most likely have a boy.
The one on top is Tulip, and the poor hen poking out from under her is Opal.
