It is matter of fact, that Naruto and Sasuke have power beyond any shinobi, but still they could use them in their fights.
Naruto using only RSM with Kurama mode :
Naruto did not use all biju chakra to gain his full power.
Sasuke is just using his standards techniques, but not his petra path.
Naruto using only RSM with Kurama mode :
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Naruto did not use all biju chakra to gain his full power.
Sasuke is just using his standards techniques, but not his petra path.