Idk cuz even in the clone wars, dual weilding seems superior. Like u said, all those jedi did use a single blade, but they could also dual weild. For example, sidious used dual sabers to defeat maul and savage. And maul even took up another saber just to keep up with sidious. Anakin took up another saber too when he faced that one chick in the clone wars season finale (forgot her name). And obi wan took up two sabers when facing savage and maul. Malgus did the same in the return trailer. He cOuld not defeat that jedi WITH his master, but than he picks up another saber and he wastes him. Its like even the lore is saying dual welding is superior...