Nightly's quote coding is broken as hell.
I've ALWAYS hated the concept of dark Jedi. Once you go dark, you cease being a Jedi.
Well, yeah, it's a very unofficial term, both in-universe and out. Technically, it refers to a Jedi who has fallen to the dark side, but many people--in-universe and out--tend to use the term to refer to any practitioner of the dark side who is not a Sith. And it gets even more confusing in KOTOR when you run into people who use the term "Dark Jedi" to apply to actual Sith, in order to differentiate them from the military ranks of the Sith Empire, such as Sith troopers, Sith commanders, Sith lieutenants, etc.
You might be onto something about there being a continual need to produce Sith-like villains by circumventing the Rule of Two in the strictest sense. I won't even argue with you on that one because you're probably right. What I can tell you is that it seems the whole Star Wars saga--movies and EU--since the time of the prequels has set up the Sith as the ones who really tipped the Force in the dark side's scale, moreso than any other dark-sider ever has or ever could.
Yeah, i strongly disliked the Sith as both an ancient race, a galactic political party, and a functional "dark Jedi." It watered down the concept, and it was part of why I never super took to the KOTOR games, and I hated it even more when it was used in TROS.
As for them tipping the scales... maybe this is why I felt out hope for EVERY PT release to give me Sith legions. Like I said, in TPM I thought maybe they were hiding, until Yoda's line. For AOTC I was hoping that Maul's body was used to make Sith clone/drones so the Sith could have an army to fight the Jedi. Even for ROTS I was hoping it would happen-- that we'd find out because they had tipped the scales mass numbers of Jedi had fallen, or gone to join Dooku/Tyranus and become Sith.
Its always fun how people can have totally different expectations and/or wants. I never expected the PT to have huge battles between Jedi and Sith. In fact my whole thought process on the Jedi was completely against what was presented in the PT. I never thought there would be many Jedi at all. I thought a few Knights errant type around the Galaxy. A few dozen on the high end really.
I always expected the PT to be much more like cloak and dagger with scheming and people turning on each other and assassinations. More like season 1 GoT type stuff I guess.
I had always thought the PT (before we knew there was going to be a PT) was going to be Arthurian. The Jedi basically being the knights of the round table. Anakin as Arthur, Obi-Wan as Lancelot, and the unnamed mother of the twins as Guinevere.
But I don't need to digress more than that. Back to the original question-- I think Sidious was wrong-- Bane at least had convictions and believed in something other than just himself. But Sidious is a villain, he has to act from ego.