If there is one thing I've learned about this breed it's that you cannot expect perfection. It is very possible those are pure cemanis. Aside from the one with the splayed leg, the others don't look that unusual. The thin short down is actually a good sign bc a feather inhibitor gene is associated with the fm genes. Recently I bought 6 eggs from a reputable breeder. 4 hatched and of those 2 had white on their faces at hatch so were placed in pet homes. I kept the two all black chicks, both of whom have grown up now into healthy young Roos. One has significant light colored leakage in his wings and the other has very mulberry comb & waddles. This breed is a work in progress in this country. Enjoy your chickens for what they are: beautiful chickens.