I have 6 mille fluer d'uccles. Should be 4 hens to 2 roos (only wanted one). Now it looks like might be 3 and 3. No one is crowing yet, but 3 of them have definitely larger combs than the rest. The largest of the group just barely has a nub for a comb. Am I right to think these are roosters or do I need to wait for crowing to be definite?