Moreover, if Sasuke masters the power of Ōtsutsuki Urashiki, his own eyes will upgrade to the Rinnegan, or even the Rinne Sharingan, and by then, it will transform into his own strength. However, the Nine-Tails within Naruto will be extracted. Without the power of the Nine-Tails, Naruto can only hope for the Sage of Six Paths to grant him the power of Yang.
But without the Nine-Tails, even with the power of Yang, Naruto might no longer be a match for Sasuke. The Nine-Tails is extremely important to Naruto; without it, even if he gains the power of Yang, his strength won't reach the Six Paths level. Just like how Asura's strength back in the day didn't truly reach the Six Paths level.
Back then, Asura's opponent, Indra, only had the Mangekyō Sharingan and hadn't awakened the Rinnegan, so his strength wasn't greater than Asura's. That's why Asura relied on the strength of others to defeat Indra. But now, if Sasuke masters the power of Ōtsutsuki Urashiki and upgrades his eyes to the Rinnegan, he will undoubtedly possess Six Paths level strength, far surpassing the power given by the Sage of Six Paths in the original story.
This is because Sasuke has already mastered Sage Mode, and due to Ōtsutsuki Urashiki's influence, his body is evolving towards the Ōtsutsuki clan's physique. Sasuke already possesses Yin-Yang power. Once Sasuke activates the Rinnegan, he won't need the Sage of Six Paths to grant him the power of Yin; he can reach the Six Paths level on his own, and with a bit more effort, he might even be able to seal Ōtsutsuki Kaguya by himself.
In essence, Yoruha sealing Ōtsutsuki Urashiki within Sasuke gave him the greatest advantage, to the point where he no longer needs the Sage of Six Paths' power. Currently, Naruto's strength is similar to the original story, albeit slightly stronger, since he can now fully transform into the Tailed Beast form, only needing the Nine-Tails' approval.
The Nine-Tails won't actively break the seal, and of course, it can't break the seal. However, its progress can't keep up with Sasuke's current pace. Even without relying on Ōtsutsuki Urashiki's power, Sasuke has already reached the strength of Uchiha Madara with the Eternal Mangekyō Sharingan.
If he uses Ōtsutsuki Urashiki's power, he surpasses the Rinnegan Madara, and can even briefly reach the strength of the Ten-Tails Jinchūriki Madara. When he activates his own Rinnegan or Rinne Sharingan, he might be able to seal Ōtsutsuki Kaguya by himself.
Naruto is unaware that Sasuke has already activated the Eternal Mangekyō Sharingan, but knowing that Sasuke defeated Pain, he realizes Sasuke's strength has surpassed his own. Naruto has always seen Sasuke as a target to surpass, but now he feels he's been left behind.
Seeing Naruto's dejected expression, Yoruha smiled and said, "Don't be so down. Once you gain the Nine-Tails' approval, your strength will greatly increase." Naruto looked up at Yoruha and said, "But even if my strength increases, I might still not surpass Sasuke, and I'm still not a match for Pain. I just fully transformed into the Tailed Beast form and still wasn't a match for Pain, yet Sasuke defeated him."
"Our gap is growing larger and larger."
"How can you be so discouraged? Your friend is so strong, you should strive to surpass him and be happy for his strength," Naruto pouted. "But the gap between us is getting bigger and bigger. It's not something I can overcome just by trying harder." Minato watched his son, feeling at a loss for words.
He had heard Yoruha talk about Sasuke, and it seemed Yoruha held Sasuke in high regard. From Yoruha's words, Sasuke's strength was indeed formidable. After all, besides Yoruha, Sasuke was currently the strongest ninja in the ninja world. Minato had just witnessed Pain's immense power, yet Sasuke had managed to defeat him.
This only highlighted Sasuke's incredible strength. However, Minato couldn't say that out loud, especially since Naruto was his son. So, he comforted him, "Naruto, if you think Sasuke is strong, then work hard to become stronger. Yoruha is right; you have great potential too." The Nine-Tails, watching the whole scene, looked exasperated.
"Hey, hey, hey, can you guys show me some respect? Yoruha, are you just going to ignore me as soon as you come in?" The Nine-Tails wasn't interested in who was stronger between Sasuke and Naruto. It was more concerned that Yoruha had completely ignored it.
Moreover, they kept talking about letting Naruto master its power. Its power wasn't so easily controlled. Even if it didn't resist, Naruto's current body couldn't handle all of its chakra.
If it were to give all its chakra to Naruto, he would likely be overwhelmed and lose consciousness. The chakra of a tailed beast was different from that of ordinary people; it carried the will of the tailed beast. Even the tailed beast itself couldn't eliminate that will, so if the Nine-Tails gave all its chakra to Naruto, he would have to endure that extreme malevolent will.
That will was something even the Nine-Tails couldn't erase. It was inherent to the chakra. That will could control Naruto's consciousness, even devour his will.
One wrong move, and Naruto could end up a fool. Yoruha looked up at the Nine-Tails and smiled, "You couldn't defeat Pain even in full tailed beast form. Seems I overestimated your strength, Nine-Tails." Yoruha's teasing left the Nine-Tails feeling helpless.
But the facts were undeniable. "That guy has the Rinnegan and black rods formed from Yin-Yang Release, which strongly suppress my chakra." Yoruha nodded, "But you still lost. You're the Nine-Tails; you shouldn't have lost."
The Nine-Tails snorted, "It's easy for you to say. If I had your power, I could turn that Pain to ashes in no time. But his Rinnegan really suppresses me a lot." Yoruha was a bit surprised to see the Nine-Tails so agitated; he was merely teasing it. What Yoruha didn't know was that, in the Nine-Tails' heart, Yoruha was as important as the Sage of Six Paths.
It was precisely because of him that the Nine-Tails hadn't attempted to break Naruto's seal in recent years. Kushina watched Yoruha, not knowing much about him. Minato and Naruto hadn't had the chance to introduce him.
From the beginning, she had been curiously observing Yoruha. Seeing him get along so well with the Nine-Tails surprised her greatly. She had once been a Jinchuriki of the Nine-Tails herself, so she knew very well what the Nine-Tails was like.
Yet here it was, conversing so gently with a human. From the Nine-Tails' words, she concluded that Yoruha seemed to be very powerful.