And Kuzan is a bigger believer in Freedom than he is in Authoritarianism.

Kuzans character aligns much more with Blackbeard than it does with Sakazuki.
Then why wouldn't Kuzan ally with the Revolutionaries instead? You know, people that are actively trying to do good in the world

I think it's possible that Kuzan sees that Teach has the potential to turn the world on its head, and only allies with him to see what will come from Teach's ambitions. But even then, that would be like Kuzan seeing Teach as a means to an end instead of actually sharing his motives
 
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