Looks like all roos to me too! I bought 8 chicks this spring. 2 bantys (hens) 2 black something or other and 4 gold orps. I ended up with only one hen besides the bantys. Ugh!
Don't give up ... the one in the first pic and the one in the back in the third pic could be iffy. I know my buff hens all have substantial combs, so you can't always judge by that.