Hi Kevin (et al),
Just talked to Jeff. The blue/lav pullet was definitely produced by the Cream Light Brown Hen bred to the Blue Cream Light Brown cock (they were actually pullet and cockerel at the time.)
Jeff has Brahmas in Buff and Dark, he has Light Brown Leghorns, and he has Dutch. And the Dutch have been securely penned all along. No way something jumped the fence, really.
The pullet bred back to her father produced the blue chicks shown on page one of this thread. In the brooder was also a BCLB chick, but I don't know who produced it (Jeff, would you please like to wade in on this thread, as I know you're reading it now!)
Jeff's working on taking pictures of the shafting now, when I get them I'll upload them here.
Thanks all.