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Can someone chuck some arguments my way in favor of Kun being the most powerful Sith Lord in history? Or give me some reasons why he isn't.

No.

I'm just reading through some old threads and I don't know if it's all bullshit... I don't know if the 'facts' are legit or theyre just massive Kun wankers

How about you just read the relevant source material yourself, and form you own conclusion(s), on said arguments?

Sheep don't survive in this ere slaughterhouse.

Do it yourself.

Considering how Kun only appears in two sources, I daresay it's not hard to find out how powerful he is.