Originally posted by Blue_Hefner
The same could be said about the people who say Sidious was the most powerful sith.
Except that was the NEC, and it's only logical given what we know.
Marka Ragnos is described by the actual author's notes, and book description - not some fallible, third party character that described Sadow. Your point collapses. Marka > Sadow is fact.