I purchased 5 barred rock pullets that were 8 weeks old back in the first part of November, 2013. The guy sexed them with a nut hanging from a string and told me he was 99% sure they were all pullets. I have 2 that have grown much larger than the other 3. The 2 larger ones are lighter overall in coloration, are developing their combs and waddles and have much heavier leg bones. I'm assuming that they are roosters. What do you think?