Are Brahmas actually hard to sex?

The internet says I need to wait way longer for Brahmas than for other breeds to be able to tell the roosters from the hens. But all my week-old chicks but one have big wings and little tail feathers coming in. Then there’s this guy with stubby wings and no tail and he stands tall and he’s the bravest and wants to hang out with me. Is he really not a roo? He’s the first pic and the rest are examples of the wings everyone else has.