I'm afraid I don't understand, if they GOT IT, then it ain't no rumor! If they don't it hurts everyone. Do you think a quality koi is gonna be cheaper or healthier next year if you start a rumor about the breeder? What the hell kind of sense does that make?
The person mentioned above also was responsible for rumors of local KHV last year, which made the hobbiest that owned the fish very happy because they didn't have to face the reality that it was THEM that killed their koi. It's easier to blame someone or something else than it is to take responsibility yourself.
The only thing rumors serve is the slimy kind of people that get off on causing problems.