The Tales of the Jedi comic, I believe, said that Marka Ragnos was "the most powerful of the most powerful," which suggests he was probably the most powerful Sith Lord in history (notice that there is no qualifier on that statement), and it's obviously not referring to political or military acumen.
Luke Skywalker said during the Disciples of Ragnos crisis that the Jedi Academy "[would/will] need all of its strength to stop [Ragnos]." This is considerable since this line is coming from the man who single-handedly toppled Palpatine.
Ragnos, even in spirit form, was able to cause superficial damage to both Exar Kun and Ulic Qel-Droma's flesh (he branded them, I think) and his essence pretty much annihilated Tavion from the inside out.
Despite slumbering for millennia, he nearly killed Jaden Korr, who was said to be one of Luke's most promising disciples (suggesting he's Kyp Durron material) and who slaughtered probably hundreds of dark Jedi and Imperial personnel
Did you, who wrote a multi page Sidious essay and spent many years trying to get Sidious to the top, just say that Ragnos is stronger?
__________________ Introduce a little government. Upset the established gangs, and everything becomes order...
Democracy is the very definition of awesome.
__________________ Every time this fool be come along
He gots you noobs cryin' out fo' mom
Leave the scene lookin' like Vietnam
Might as well call him "Matt Atom Bomb"
Like his name suggests, he's quite atomic
And this fool - he likes DC Comics
Two energy swords make up his symbol
And trust me, dawg, this homie's nimble
__________________ Introduce a little government. Upset the established gangs, and everything becomes order...
Democracy is the very definition of awesome.
the thing with that is that Ragnos is in a totally different separate time-line. The most powerful of the most powerful doesn't mean in the 4 dimensional universe, but rather at his point in time. so STFU.
But then, if we no longer are bound by the natural laws of canon, that means I can dispute that Bandon is superior to Ragnos despite any text, comic, game, or film's offer of knowledge!
Bandon winz cause he totally force pushed some guy into a computer and destroyed the computer with an explosion because the guy was just walking past. I mean... epic.