If you guys are following the anime he says the same thing again ("Medaka is always right", explicit words) during the Miyakanojou/Flask Plan confrontation. The most probable point you could note for when Zenkichi began wanting to disagree with Medaka is when Medaka decided to trust Kumagawa, and made him Vice President. In fact, that was the direct cause which lead Zenkichi to feel like he had to prove himself which lead to the Treasure Hunt incident.
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