bobbyrk posted...
My dude, of those sources I posted, literally only
one
isn't an out-of-universe material literally stating directly he's the most powerful Sith to have ever existed. There's nothing there saying that Plagueis was stronger, or a better duelist, literally in anything except the beginning when he's first training Palpatine.
Plagueis lost, and is dead. He died to trickery and cunning, like so many other Sith before him. It's kind of what they do.
Plagueis was a master of all seven lightsaber forms, being able to move at light speed, and would have easily outclassed Sidious in a one on one lightsaber duel, through Palpatines own admission.