I would say the first few pics are a Cochin cross. Most likely to barred rocks but Dominique's or cuckoo marans are also possible. What color eggs do the lay?
I was told they are bantam Cochins. And they layer white. The last little one I was told Old English Bantam. She is still very young. I got her only because she had been hand raised and I thought she would be good for my kids to handle. So far she is great. I also can not tell which sine rooster in my new crew.
How old are they? It looks to me like the one in the middle of the first and second pic is your roo. That one shows the most comb and waddle development. Typically the roo has a slightly different body shape than a female, and in barred types he is usually lighter than the females. Also on his neck and near his tail may be slim pointy feathers.
Edit to add: I suspected crosses because of lack of leg feathering in some.
The bantam is not a sumatra, they have long legs and super lean bodies. I believe she may be a black bantam EE because of her muff and it appears to be a pea comb.
I would agree that the top ones are barred Cochins.