Hens shouldn't have so much black, and it looks like you have some clean or very sparse shanks. I think quality wheatens tend to have better shank feathering than the other Marans varieties.
It's just speculation, but in the past we've discussed what happens when you use wheaten sports from Black Copper Marans in your wheaten breeding program. This could be the source of the genes causing the extra black in hens, and the restricted black in the one cockerel. The one cockerel with the all black chest could also have more black than he should. You won't know until his hackle and saddle come in. But Black Copper Marans carry extra melanizers, and often carry the Db gene that causes the very orange, restricted black coloring in the one male.
It's just speculation, but in the past we've discussed what happens when you use wheaten sports from Black Copper Marans in your wheaten breeding program. This could be the source of the genes causing the extra black in hens, and the restricted black in the one cockerel. The one cockerel with the all black chest could also have more black than he should. You won't know until his hackle and saddle come in. But Black Copper Marans carry extra melanizers, and often carry the Db gene that causes the very orange, restricted black coloring in the one male.