Your pictures don't show. I wouldn't be culling until I was sure. How are you going to know which roosters are light and which are dark? Anyway, if it was me, since they are so rare, I would make two pens, a light and a dark. Are they just two weeks old?
Have you read this thread?
https://www.backyardchickens.com/forum/viewtopic.php?id=308555
Have you read this thread?
https://www.backyardchickens.com/forum/viewtopic.php?id=308555
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