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Sonny clearly orchestrated Zaion's suspension. You see, she's a shotacon and she was getting territorial with his victims Alban and Kyo. This, along with the her no longer playing the imouto role for him pissed him off. He needed to take action and fast. Notice how the sonnyban fujobaiting ramped up again when Zaion was out of the picture?
Let this be a lesson when you get into NijiEN: NEVER say no to Sonny.