You're telling me at the start of Shippuden Naruto and Sasuke are kage level?
Madara had Hashirama as rival, he was only OP during the Ninja war when he first got reanimated. (He didn't really stomp anyone other than that)
Kaguya didn't exist until very late series and instantly was rivalled by Naruto and Sasuke...
I guess Boruto would fit what I'm asking for since there's no enemy atm rivalling Naruto/Sasuke.