Emperor Revan
Most Powerful Sith Lord
LORD DARKSTAR: No he probably didn’t master all the forms, but he did use a unique one before Bastila and her team, and he did learn from Hord’s holocron. IMO, it doesn’t matter much since if you’re powerful enough, your technique doesn’t help a whole lot.
Like Kreia says, Combat makes one stronger and isolation weakens one. Lord Revan was constantly in combat for 6 years, while Yoda didn’t have to fight much.
As for Tulak’s holocron, they can store tons of information on those, and even answer questions. It would be almost as good as the real thing. And Revan was a very quick learner. Like Zhar said, he can do in weeks what many cannot do in years. Even if he didn’t master it, it would definitely help him a lot.
Revan was a Jedi master when the Mandalorian war started, so he had access to everything. And he had a lust for knowledge, seeking out everything he could whenever he could, again like Zhar said. He had 4 years of Malachor V and that was his main stronghold so he would be there a lot, even with the fighting since he learned all this before really entering the war himself really. You have to remember, he lost all this knowledge when his memory was wiped and then he got about the training of a padawan (so he didn’t learn a whole lot) and he became even stronger since his first reign. Then he later recovered his full memories, skyrocketing his power. He didn’t have just books either, he had holocrons, artifacts, relics, etc. some of which would simply increace his power by having them.
About his confidence, well maybe you’re right, but he’s defeated everyone he’s ever faced, and that’s hundreds of powerful opponents so I wouldn’t call it arrogance. It really isn’t important though since most any Sith lord could’ve defeated the remnants of Bastila’s team (3 people or so).
As for Wikipedia, right you are, it does have some false stuff. Still, it is a very good source for general information and it used to say “As one of the most powerful Sith lords of all time” instead of what it is now “Thought by many to be the most powerful Sith Lord of all time” about Revan.