I would think if they were silkie/Cochin crosses, they would all have feathered legs since they're both feather legged breeds. Also, all of the silkie mixes I've had have had some sort of crest- be it big or small- and dark skin and legs. I have no idea what they are, but they're super cute! Good luck with them!!!!
there is no silkie in them. if they had silkie they would have 5 toes, slate colored legs, black skin, a different type comb (more a walnut), feathered legs, possible small crest, possible beard.