Why Darth Vader was Never More Powerful Than the Emperor

Star Wars recently revealed the true reason why Darth Vader was never able to become more powerful than Emperor Palpatine.

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So guys let's settle this ,prime Luke vs prime Vader , who wins??? Remember this isn't prime Anakin but Vader so answer based on that and don't take things out of legends

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Is Darth Vader more powerful than Palpatine in Canon? Please give a detailed reason. - Quora

Why Darth Vader was Never More Powerful Than the Emperor

Who is more powerful, Darth Vader or the Emperor? - Quora

If Darth Vader Legitimately Attained The Rank Of Emperor, How Well Would He Lead The Galaxy?

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