Agree with @LaFleche and other above posters, 2 are cockerels, 1 undetermined, rest pullets.
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You are not wrong. From what I understand, originally Martin Silverudd was trying to create an auto-sexing breed that would be a good layer of green eggs, the "Swedish green egg layer". He passed away before this project was completed. Other breeders stepped in and changed the birds name to Silverudds Blue (after being called Blue Isbar for awhile) in his honor. Apparently the blue feather genetics makes is difficult to auto-sex this breed. The differences between the genders is subtle at best. I do not know if some breeders are working on the autosexing trait.Sorry if I’m wrong, but aren’t Silverrudds autosexing? Or are they ones that are hard to tell?