Well look at this way....Say you had a top class dog like barny for example and you and your mates have never had a dog like it. Then he dies suddenly and you never had chance to breed him to your top bitch....but your parents owned his brother, bengi, for example..but he was purly a pet and has never even seen a rabbit. would you use him as the next best thing, as the bloodline is identical. A non worker is different to a failed worker dont you think?