Ok so I have experience sexing chickens just from like looking at them and I can tell you that your bard rock is probably going to be a rooster and you're like Brown white one looking at the development of all the other ones that you believe are hens I also agree with you on that I would say that they would probably a rooster but looking at it it could also be a hen with those kind of chickens you don't know until they get a little bit older. I do believe that your bard is a rooster though by one the way you looks to the kind of like enlarged spur scale and there the bigger comb than everybody else which is a key factor on roosters.