I kind of doubt that the "best breeders in the country" would be selling on eBay! Or were the sellers claiming they came from those "lines," as people often do no matter how many generations removed from X Y or Z's "line?"I have a little experience with breeding the heavy marked males to get a better colored female Hackle. Yes this will help with the female hackle but in my experience the Males from this will have too much Copper on the breast. Myself I would rather use a male that had just a few Copper feathers in the breast area.
We have Nine BC females from the experiment with buying eggs from ebay last year and they show no Copper at all. This egg experiment was a total disaster as for Color. These came from the supposed best breeders in the country. We culled all the males at an early age. I just do not believe in keeping anything if I do not have a purpose for it in the future. Don