I am NOT thinking about getting silkies. But if I did I know that the silkies are smaller as chicks. Based on the timing of the local feed stores, I could get 2 silkies about a month earlier than picking up 2 EE (I am NOT thinking about these chickens, either). Would this potentially work out in terms of chick sizes? How much older would be best to have the silkies be than the standards?