I don't like this Nadia stuff either. The execution in this update was just plain horrible, she was shoved in for the sake of convenience without any good reasoning behind it (felt like you needed a new baddy so anything went for that reason like her sudden "takeover"), it went against not only normal but even in-game logic (Dik never contacted the MC about a massive change like that or even considered talking about it with him while he already became heavily invested in the island), it teared apart most of the characterizations that was built up so far both for Leah and the MC ("imma fight to regain my position", "I won't go against her because of the Island") and alltogether it's just simply doesn't work. Unless the current content of her would get a massive redo, which I doubt that will happen because that would affect later events and how exactly they plays out as well, this has pretty much fucked the main story flow, which was honestly going pretty well so far. Creating conflict is one thing, creating conflict by using incoherent tools for the sake of conflict is another, and not a good one.