It seems as though the DP backcover quote is being taken nowadays, in which case Plagueis would be canonically more powerful than SWTOR Vitiate. Sidious surpassing Plagueis, then, would put an end to this debate.
And logically powerscaling from there, DE Sidious > Valkorion.
Good for those select few. Unfortunately the quote isn't objective or all encompassing so it's just confirmation bias for those who want to take it as gospel, and just a quote for others.
Yup because I want to establish a certain pattern here, especially if in future SWTOR chapters we get more and more Valkorion quotes. Otherwise I will throw it in the face of those taking Palpatine quotes at face value.
Valkorion's quotes in SWTOR would never apply to any characters past that time, so Plagueis and Palpatine and most of the characters we debate here would be safely excluded.
Palpatine has quotes from 2015 declaring him to be the most powerful Sith Lord, but regardless, sources do not have expiry dates. They have to be outright contradicted to be rendered null and void, not just because new characters are created. The way continuity works is that everything new is created under the assumption that it follows continuity unless that continuity is explicitly changed, which, as of yet, it hasn't been. Palpatine's been touted as the most powerful Sith Lord ever for decades, by a wide variety of authors and numerous different types of sources. It's one of the most unanimously supported facts in continuity.
And none of the Plagueis/Palpatine quotes would apply to Vitiate, SWTOR, or anything written after the quotes..
They don't have to be explicitly contradicted, they can be implicitly contradicted (which has been done by Vitiate/Valkorion). And if you're going to sit there and say quotes are all encompassing even before newer information is given, then if a quote arises for Valkorion being the most powerful "of all time", it would include Plagueis/Palpatine and would be just as valid.
No, because the sources for Vitiate's supremacy encompass only up to TOR (in-universe), and not after, hence, Plagueis and Palpatine are unaffected. Plagueis and Palpatine's quotes, on the other hand, do encompass history up to their time, which thus includes Valkorion. You also failed to account for the fact that Plagueis' quote came in 2012, which was after Vitiate's SWTOR debut, and Palpatine's quote came in 2015, which is also after Vitiate's appearance.
Vitiate doesn't implicitly contradict anything.
If Vitiate gets a quote from a source that does include Palpatine, and the quote says that he's the most powerful, then yes, it's a valid retcon and he's then officially more powerful than Palpatine. But such a quote is yet to exist, so Palpatine's supremacy remains the one supported by material, and it's so widely supported that you can't really argue against it. Such an argument would mean a denial of decades of established (and as of yet, uncontradicted) continuity.
Personally I've revised my stance to take quotes, including back cover quotes, into account if they confirm an issue that I was ambiguous on. I.E. Caedus and Vader after learning a little more about Caedus's capabilities and Plagueis and Vitiate. This applies to general quotes I didn't take into account before such as Vitiate > Nihilus.
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Stop using the Darth Bane quote. It only refers to dark side masters of his time, which were few and far between. It doesn't refer to all of history whatsoever.