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.
They can be tougher because they should have pea combs, which aren't as easy to differentiate as single combs. So you are looking for color and the bulbous look in the combs of cockerels. 6 to 8 weeks is usually enough. Sometimes earlier, sometimes later. Nothing is cast in stone when it combs...
BSLs are variable, and some have a lot of brown. So it could be one.
Partridge Plymouth Rock is my second guess.
It's a wait and see thing to know for sure.
If it is a purebred barred rock then it is likely to be female. Males of this breed will look paler due to being double barred, which means the white barring is wider than the black areas on the feathers. Females are darker.
Also, BR males tend not to get the overwash of color on their yellow...
I'm not sure. If they look healthy and behave normally, then they are probably just very slow growing. They should always have quality feed always available at that age, and it must be high protein, like 20 to 22%. The feed should contain all of the vitamins and minerals necessary.
If they have...
Are you sure these are 5 weeks? I could see 3 weeks maybe on these. Otherwise something is not right. Sexing them won't be accurate, either, if their development is that delayed.
Sapphire olive egger seems like a good bet. Probably cream legbar crossed with blue Marans. Or they could be second generation olive egger crosses since the egg color isn't consistent.