Kuzan probably doesn’t think it’d be any worse than it is now. Like kuzan actively hates Sakazuki and his ideals. He doesn’t show any issues with BBs.
Yet he tells Smoker to tell Sakazuki about Doflamingo.

He might have his issues with Sakazuki, but he ultimately wants the best for the Marines. BB has said he wishes to plunge the world into chaos, that doesn't align with Kuzan's morality
 
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