It's looking like a cockerel to me, but the comb isn't so big that I would say it is definite. Keep a watch on the comb and wattles for growth and color in the next few weeks. If there aren't rapid changes during that time period then you have a pullet.
I wasn't sure if it was the same genetic mutation in both breeds, but I'm reading that it is. So that would make it a recessive gene in Hedemoras just like with Silkies.
The only problem I can see is that this breed is so rare. If you can find a seller who will guarantee silkie feathered...
3 is a definite cockerel. The rest are pullets.
5 must've had Silkie or Hedemora in its mix because it is silkie feathered. The Silkie gene is recessive, so the parents don't have to be Silkied themselves to pass it on, but both parents must carry the gene for it to happen.
It depends where they are from. If from a hatchery or store, it should be purebred even if not quite up to the standard. If it is from a backyard breeder then yes, it could well be a mix.
Is it a male? Probably, with that amount of black in the plumage. But not definitely. I would give it time.
My hunch is that both are pullets. Males tend to get large patches of solid color on their shoulders-- but not always. Females should have even lacing on the shoulders, although they, too, can show small patches.
It's impossible to know whether those birds are fibro or whether they have lightly feathered legs. I think it is more likely they were derived from Slikies than Hedemora. But it seems to be a variety that is long gone.
If I was trying to create what you are talking about, I would start with...
I see some bits of white on the wings and some funky feathers coming in on the upper back. Those things combined with the large comb and wattles are white I think it is male. I think within a few weeks it should be clear one way or the other.
There is no way to tell gender in that breed at a very early stage. It's just luck of the draw unless you find sexed pullets available.
These are hatchery birds, so the product will vary. It is possible to see feathered legs on chicks if you look closely. But I am not sure that will have an...
Bantams generally are not docile. They are very active and noisy, and they do not usually lay that many eggs compared to large fowl. So your friend will have to sacrifice some things somewhere to make it work.
Cochins, Silkies and Brahmas can be docile, and Brahmas are good layers for bantams...
It's early in the game. The Legbar type Easter egger is a female, and I see none that look to be males at this point, except the Zombie. It has a large comb for that age.
So far so good. Keep an eye on them for quick growing combs or color developing in the combs. If you end up with 9 pullets and only 1 cockerel, luck is definitely on your side.