I'd say keep the ones you like and they will find their place and friends within your flock. IMO there is nothing worse than having a bird in your flock that just doesn't do it for you or your flock.Yeah, my guess was it's just a different breed having its own quirks. But the 4 of them have a LOT of individual variation between them, too, so maybe that's a factor, too... They cover the entire spectrum of friendliness with humans - from one extreme, where my favorite of the 4 was very social and friendly with people from the start, seeks me out and snuggles with me etc., through a couple of intermediately friendly ones, to the least friendly that won't let me touch or even get near her, and will scream and protest if I try to hold her. All 4 spent the first month of their lives in our house being handled every day by all family members, and while the two middle ones did warm up to humans through exposure, the last one never did, so that seems to be just individual variation. Like with the Barnevelders. Nothing beats the Orps, they are always best all around, especially Papa's
My big dilemma now is whether to care about the in-fighting when picking which of the Wyandottes stays. The two that I want to keep (the most human friendly) don't get along. But they are confident within the main flock, so maybe it doesn't matter.