I see I must have missed your post earlier. I know we had a conversation, I believe it was on here about how the leg feathering worked. I'm not sure I could direct you to it tho as its been quite a while back. My philosophy on making decisions what to cull is about what you want to choose to work on. If finances are a concern, where you are feeding the organic feed, I'm sure its a killer, I would sell the birds off as layers and in general select for the birds that are closest to what you would want ultimately.
I already culled the clean legged ones, do you mean cull or sell off the siblings that have good feathered feet since I don't know if they will throw clean legged offspring eventually?