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Considering Riku madara brought carnage to the entire world yet was beaten by someone easily shows the power gap. So for someone this strong to call someone else invincible that is a powerful feat
He was not beaten. Beating implies an actual one-on-one fight, not a sneak attack when one of them thinks the other is his own will. This is no way to asses power levels between characters. If anyone was in the same place as Madara, including Itachi, they would have suffered the same fate. You're literally arguing a back stab is enough to asses who would win in a proper one on one fight. Black Zetsu is not strong at all, not strong enough to even beat Mei and a few other Jonins, his only reason for being able to take out Madara is sneakiness, not power.
if itachi explains the (obvious) weakness, it's not a mary sue.