I pretty much agree. They look like pullets but with the feathered legs I can't see how those look, a cockerel tends to have heavier legs than pullets.
The posture of the one with dark red in the wings is suspicious but it could go either way. I would expect a redder comb and probably some wattles if it were a boy but brahma are slower maturing than many. Slower maturing may also explain why I don't see pointy saddle or hackle feathers. Some of them are just harder than others. I've a 16 week old mixed breed chicken that I could not tell for sure at 16 weeks. I was ready to give it to a young couple starting out as a pullet but just wasn't sure so I didn't. It was a boy.
My guess on that one is a boy but that's maybe a 60% confidence level. Don't do anything dramatic or drastic yet.
