bacres just so you know I've been doing this Silkie thing for a while now. As far as space, I don't think I know anyone that ever has enough space when it comes to chickens even when they have an entire barn to use. So whatever is going on here, I'll wait for Suze or one of them to chime in that might have a clue. Like I said, she and I have talked back & forth about this for a couple of years.
The issue that makes this strange is that it never shows in the females, never. It is sex linked, which is not supposed to be possible with silkies. And at some point this should stop happening by dilution with more whites but instead it is intensifying. What ever it is the males are carrying to copies, that is why the thought in the early going was that it was a double silver gene. But unless one of the genetics specialists chime in and say its the silver gene then I seriously doubt that's what it is.