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This is the kind of dark and glossy I mean. See the "cape" of dark red feathers? You should be starting to see those on Teddy's wings if she was a boy.

They would be a dark, mahogany red. Her coloration is female. The color black in chickens should be glossy and green in the light on a healthy bird, regardless of sex.

Your OE look to be pullets. The GLW has a suspiciously red comb for only 7 weeks, but that isn't a dead giveaway unless it really pops and gets bright in the next couple of weeks. I'm leaning cockerel but it isn't a done deal. I can't tell on the SLW. Assume it's a pullet until it either crows...

Hen/Roo game has a lot of rules. There are certain traits that cockerels will have at prepubescent ages that pullets are less likely to have (large red combs and wattles, namely), and there are certain colorations that only females can have that males never ever will (look up silver duckwing...

I didn't see any cockerels in any of the photos you posted

The 3 brown chicks have female specific coloration. Cockerels won't look like that. They're girls. Teddy is female.