I would almost bet money you have the perfect trio there: 1 roo and 2 pullets. None of them have a very red comb either yet. Definitely I can't see very large, or RED comb and wattles. Way too pink for roos. Also, there might be some pointy saddle feathers and tail feathers on the one...But from what I can see they have still got very round saddle feathers. And yes, a female will posture up to a male. They are just so tricky, cuz Orpingtons are such a heavy, large type...Some big mommas there can look like roos. I have the exact same thing going on, but my birds are just a couple weeks ahead of yours. I'm still waiting...Have one that displays both roo and hen characteristics and it's driving me crazy. LOL.