I have four light brahma chicks all born the same day. One is extremely bigger than the other three. Not quite double the size of the other ones, but definitely a lot larger. Does this mean the large one is definitely a rooster? It also has tons more feathers on its feet compared to the other three. They are about 4 weeks old and the biggest is almost completely feathered and the other three are still partially feathered. Sorry don't have pics.