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Well, it wasn't played with a full random setup.
It's about the color change. If you're playing and switching colors, blue gets an advantage when choosing a castle, and red gets the advantage of the first turn. If you play, alternating colors from game to game – one player plays 2 times as blue and 1 time as red, the other – vice versa. This creates some inequality. That's why both a full random setup and changing colors after a subjective restart are used.