I think this discussion is interesting having bred horses for some 25 years. Novice breeders are swayed by what they think the terms mean; experienced breeders fully understand the terms.
ANy one who has breeding for a long time knows, that you have a better chance of producing champion stock if you breed to champion stock. The buckeye is still low in numbers, so even a small show with only 20-30 birds and the top bird was a buckeye that day, kudoos to that bird and breeder. THat day, that bird DID earn more points than the other entries and that should not be negated. Of course, in a very large show of 1000 entries, the value of highest scored bird has more value.
But just remember, number two, three and fourth place have value too. As a breeder of horses, I can't breed to the top horse if it's the father or brother to a mare I already have. And I don't breed my birds that way either.
If a bird won, give him the credit he deserves. ANd when young stock are bred from the champions, yes, to me that is champions lines. I have such a mare, and hope to have such a chicken someday.
All in my humble opinion and experience.