Sidious got picked up and thrown down a hole.
By the Chosen One, that arguably entered a state of Oneness.
and Plagueis choked to death.
After tanking Sidious lightning like a boss - while in a less them optimal condition.
Hell, if anything he's got a leg up on them, because he knew it was going to happen and let it anyway.
Yeah, because he thought was gonna get a leg up, but his plan failed horribly in the end, as he's forced to live his death over and over again for all eternity.
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Teneb was/is a failure of monstrous proportions. You'd think a guy that coulld use complex mathematics to predict the future would have a better success rate.