Brachydactyly is the other side of the toes, and is too short outer toes, frequently missing toenails. If the bird has 5 toes, and the hind two are okay (as in less than perfect, but not horrible), brachydactyly would take precedence with me over not quite right 5th toes. FWIW, in Europe it is a DQ, and the European breeders consider it quite important to select against.
I did not know this! Thank you, Sonoran.