I'm not so sure about that.
Darth Bane is already loosely comparable to Revan at least, and we know for a fact Tenebrous >>>>>>>> Bane. Plus, his casual displays of TK, can match Revan's best, he is a more sophisticated combatant given he can use complex mathematics to predict the future, and thus anticipate moves, and he prolly a better duelist too, given Venimas performance against Hugo. Let's not also forger about his elite barrier showing.......
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