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!
Wow, all roosters! Should be some good eating, lol. Here is a picture of 2 roos and a hen for comparison. They are around 8 weeks.
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.