You think PCS scores of 9.25, 9, 9.5, 9.25 and 9.75 (judge 7) is lowballing Yuna? Three of those are as high or higher than your "good judge" average.
You missed the point.
None of the (hypothetically) colluding judges' scores can accomplish anything on their own. Judge 7's scores would be part of a strategy in combination with Judge 2, 4, and 8.
Quote from the link I provided in a previous post:
A player's strategy, in game theory, refers to one of the options he or she can choose in a setting where the outcome depends not only on his own actions but on the action of others
**ETA - they have to incorporate high scores into the strategy, and vary them among the 4, because if they don't -- if all 4 judges were to score low across the board -- it would be too obvious. The point is not just to cheat, but to get away with it lol. The judge who scores totally high for Adelina, and totally low for Yuna, is essentially immune from issues of credibility, because those scores were thrown out anyway. Nonetheless they are the most important ones in this hypothetical strategy.