Kim, several of us are involved in "Project Delaware", having been supplied with F1's from excellent BR and NH stock. I have 9 I am growing out at this time. I also have seen the gorgeous Del hen Doug Akers had at Ohio Nationals who was the result of a cross between a BR and NH. He would not sell her to me, so I suspect he is going to keep breeding. There are pictures of her either on this thread or the Delaware Dilemma thread, if you look back into November's posts.
I do not have all the answers on the breeders, I know only a few things. Paul Harter's stock is partly from a woman in Mo who had very old lines, and I believe some of the Braden stock is from that same woman. I would have to look in my notes, which are buried somewhere; her first name was Colleen, her last name eludes me at the moment. I believe Janet at one point in time had stock that traced back to some of the original birds, but I do not know if that is still true. It has been very difficult to find old breeders. Most of the ones I have met do not breed Dels anymore.
I personally think a lot of breeders get frustrated with the inconsistencies. They will get 4th generation birds who throw a red feather or something like that and it frustrates them. I am not sure if it is the same with chickens as it is with horses, where you can get throwbacks as far as the 6th generation, but if it is, then you have to fight through the problems, and keep working at it. Crossing the BR and NH now is acceptable, from what I have been told, since if a bird from that cross looks like a Del, walks like a Del, talks like a Del, it is a Del.
Or so a reputable judge said.