Yeah, they all look like cockerels :/ Do you have any updated pics of the reddish one? I was curious what it'd look like :) Also, the first two look like Olive Eggers now!
Keep checking the bottoms of the black one's feet. If white/pink it's likely an Australorp. The one with green legs is an Easter Egger. I am intrigued by the red one. Update pictures of the mottling! Meyer does carry Swedish Flowers and I think that's a possibility
Welsummer cockerel and Easter Egger. As younger chicks it looked like you had another EE, along with a Rhode Island Red (maybe Buckeye) and a Jersey Giant