I'm terribly sorry, but the only pullet pictured is the third photo. The first two are, without a doubt, young roosters. Those big red combs and incoming saddle/tail feathers confirm it.
Orpingtons are late bloomers, so I'm not shocked the Breed & Gender community didn't think they were cockerels, especially in comparison to the faster-developing boy. Looking at the old photos, I would've said you had maybe two boys out of the four. But now that they are much older, it's clear that there was sadly only ever one pullet. I'm truly so sorry, it's a sucky thing to have happen. Hopefully, you'll have some luck rehoming them, as Lavender Orpingtons are a lovely and sought-after breed.
