Had watched one of his videos, when i seen the title: the best breeder in the world i just closed it.
Even if he were i dont like people talking about themselves like that. And most likely he is illiterate as well.
Anyway heres a treat about inbreeding if you have sometime, it explains both the pros and cons. http://www.angelsplus.com/ArticleInbreeding.htm
EDIT: I might have a more scientific answer in the coming days since one of my best palls is a fish scientist as i call him ;)