The fact sasuke in the end recognizes his power, either means 1 of the 2...either he's on the same level as sasuke, or sasuke recognizes naruto is stronger than him, which is the former in the boruto series, when sasuke mentions, only naruto can rival with his power, Kurama or no kurama, you need to admit naruto power comes from more than just learning at a fast pace, it comes from him changing people's hearts and minds, that was the intention of kishimoto all along, true power doesnt always comes from fists or kicks, but from the heart, and naruto showed to everyone how to overcome darkness.

Even itachi knew how strong naruto has become on their last battle, and even said he was like shisui, at heart...and we all know shisui didnt fight much, but he was very skilled, but above everything is, he was kind hearted, along with itachi tried to change Uchiha clan.