I think the "what to expect" section that Greenfire Farms puts on their terms and conditions page is very interesting and holds true for most breeds that are extremely rare.
It states:
"What You Should Expect. You should expect birds that reflect the fundamental attributes of the breed. You should not expect a cosmetically perfect bird. In fact, you should expect to find some defects in virtually every bird you raise. Just as every child is not destined to become a supermodel, every bird is not destined to win ribbons at shows. Only a tiny fraction of chickens conform to their breed standard in all respects. We do not represent that every bird we sell is show quality or is flawless. You should receive birds that can be the foundation for a breeding program that with enough time and skill can produce show-quality birds. You should also realize that the rarer the breed, the more likely you are to encounter problems related to inbreeding. For some breeds and varieties that we sell, the global breeding population consists of fewer than a dozen hens. We cull for obvious defects like crooked toes, but low fertility, low egg production, low disease resistance, and other challenges are not uncommon with extremely rare breeds. If you encounter these challenges when the birds become adults, you will need to address them with your own breeding plan."
I work with a breed that has an extremely small gene pool. Improving to a standard involves hatching a lot, culling a lot and keeping meticulous records. Over time you can get them to where you want them. There can be many setbacks but persistence pays off.
