Brian Parks is indeed a breeder with integrity and a nice set up. We hatched out some of Brian's LP eggs. All the cockerels had excessive copper on the breast (like 80+%) and were culled, but some of the pullets look good. We have one of Bev's cocks (from Brian who hatched him from her eggs) and some laying LP pullets now.
Maybe I shouldn't be upset that I didn't get any cockerels, then! However excessive breast copper seems to be a problem with this breed in general. How old are your LP pullets now? Are they getting any nice copper hackles? Of my Bev Davis chicks, I have 7 cockerels to choose from, only 3 pullets. From Brian's line, I ended up with 3 cockerels and 6 pullets. Unless there are some late bloomers, but I doubt it. Marans are easy to sex early and these are 6 weeks old now. I plan to grow them all out a little longer, not cull as early as I would if I hatched them myself. I have plenty of chicks from my own lines to work with this year as well.