Going by Black Zetsu's statement of deceiving the Uchiha over the span of centuries, and getting the transmigrates of Ashura and Indra to fight one another, the previous transmigrates had to have power atleast comparable to Madara & Hashi, or BZ wouldn't have wasted his time on them. Not to mention the guys knowledge in MS/EMS abilities and techniques didn't come out of thin air. He had to have seen previous Uchiha achieve that type of power beforehand to even make such assumption's and statements.
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