I bought my chicks from Tractor Supply as Straight run, I had 3 that feathered out real fast and long and others took much longer and looked like their wings were short and even.. So I thought I had at least 3 pullets and then 3 cockerels by this.. now at 4 weeks the feathered out ones are the biggest and their combs are redder and larger.. I am confused on these.. Any help from someone who has raised these....Thanks