Yeah, I understand your point, Fred. I'd already considered that. But, let me play the devil's advocate for a moment...
An "unscrupulous" judge has entered a German pils which he feels is spot on. In the course of judging another category, he comes across another beer that he feels is spot on. Maybe this judge doesn't want to go head to head against this other beer in the BOS round, so he doesn't quite give it the score it deserves. I know this is a worst case scenario, and hopefully rarely, if ever, happens.
What Tom said is not really a "good reason", although he has stated a fact.