Naruto and Sasuke's abilities always reflect each other, Naruto has the 9 tails and Sage Mode, while Sasuke has the EMS and had the Cursed Seal. And I believe that this is a clue to how Naruto's power will develop.
Sasuke lost the Cursed Seal which was originally his main power in battle, and got the MS and later EMS, however Sasuke can still use Cursed Seal by using Juugo, which I believe will develop further later on.
I think something similar is happening to Naruto, he has lost the 9 tails, but his Sage Mode will drastically develop, he will probably learn more about Sage Mode and how to take it further or use it in different ways, then he will get 100% Kurama and meld both forms and abilities.
Kishimoto spent a lot of time developing Naruto's abilities as a Jinchuriki, and there is the issue that Naruto's abilities as a Jinchuiki perfectly counter Sasuke's EMS abilities:
Naruto's speed counters Amaterasu,
Naruto's chakra cloak counters Susanoo,
Sasuke's Sharingan counters Naruto's speed,
the 9 tails can protect Naruto from Genjutsu,
and so on.
Naruto and Sasuke are Yin and Yang, even the colors of their forms when using their powers counter each other, when Naruto uses Kurama's chakra he glows golden and shines brightly while Sasuke uses Susanoo he gets a dark color.
It wouldn't make sense for such symbolism to be their and not come into play during the final fight.
Kurama is the counter part to EMS, and Sage Mode is the counter part to the Cursed Seal.
Sasuke lost the Cursed Seal which was originally his main power in battle, and got the MS and later EMS, however Sasuke can still use Cursed Seal by using Juugo, which I believe will develop further later on.
I think something similar is happening to Naruto, he has lost the 9 tails, but his Sage Mode will drastically develop, he will probably learn more about Sage Mode and how to take it further or use it in different ways, then he will get 100% Kurama and meld both forms and abilities.
Kishimoto spent a lot of time developing Naruto's abilities as a Jinchuriki, and there is the issue that Naruto's abilities as a Jinchuiki perfectly counter Sasuke's EMS abilities:
Naruto's speed counters Amaterasu,
Naruto's chakra cloak counters Susanoo,
Sasuke's Sharingan counters Naruto's speed,
the 9 tails can protect Naruto from Genjutsu,
and so on.
Naruto and Sasuke are Yin and Yang, even the colors of their forms when using their powers counter each other, when Naruto uses Kurama's chakra he glows golden and shines brightly while Sasuke uses Susanoo he gets a dark color.
It wouldn't make sense for such symbolism to be their and not come into play during the final fight.
Kurama is the counter part to EMS, and Sage Mode is the counter part to the Cursed Seal.