I always have trouble with a cream legbar. They have various inhibitors and modifiers that can do some strange things. I think you have the chance of an unusual color of feathers with this combo. You may get certain parts black or certain parts some kind of off-white. The heads on the hens and the heads and other parts on the males will be red. Anyway the males will be barred and the females will not be barred. I don't know if you will be able to see the spot on the head at hatch, I don't know what the down color or pattern will be. If you can see the spots they are black sex links. If you can't see the spot on the males' head technically they are not black sex links but the males will feather out barred, the hens will not. The pullets will lay green eggs, potentially olive color.
The other two will not give you sex links. In theory the offspring from both roos will all be solid blue but in practice you can often have some random exceptions, maybe a few feathers will be some other color. The male may have darker tail or wing feathers. That's normal with blue. The eggs will be brown. The Marans roo's pullets should lay darker eggs than the Favorelles' pullets.
