One of the things I most enjoy about breeding chickens is that there is not a pedigree confining , Big Brother registry. I welcome the freedom to breed 2 birds , regardless of pedigree.
I made my own winning Buff Silkies in the early 80s by breeding with ONE cock bird for 5 generations.The proof was in the pudding...the pullet won RB at the combined ABA-APA National, BEFORE buff Silkies were registered by APA. Her half sister won BB., also by the same cock.
As a long time dog breeder of over 50 years, I can tell you that most pedigrees are entirely dependent on a breeder's integrity. Now AKC is DNA testing often used stud dogs. They caught on to the fact that so many top winning dogs were not actually siring all those pups. Something long time breeders used to laugh about.
Try breeding bird to bird , taking into account faults, and virtues of each, but do not be constrained by a pedigree.