Of course, Sasuke's strength was actually not bad.
Under normal circumstances, the three-tomoe Sharingan indeed couldn't defeat the Mangekyo Sharingan, but Itachi was in poor condition, critically ill.
Sasuke himself had mastered the power of the Cursed Seal, which was a simplified version of Sage Mode. Coupled with Itachi's deliberate holding back, defeating Itachi didn't seem impossible.
Sasuke, who had just awakened the Mangekyo Sharingan, might not have been stronger than Cursed Seal Sasuke, as he was no longer able to use the power of the Cursed Seal at that time.
Now that Katsuyu said he couldn't directly awaken the Mangekyo Sharingan, possibly as a protection for his body, Kazuki could understand.
He prided himself on the fact that his ocular power was already no less than that of Kagami with his Mangekyo Sharingan back then. If it continued to grow, his physique might not be able to keep up.
Theoretically, each upgrade of the Uchiha clan's Sharingan brings an increase in strength, and their Chakra volume also increases. This is a physical growth driven by the Sharingan, but continuous enhancement in a short period may not be beneficial for the body.
Being able to use Susanoo was also a good thing for Kazuki.
Although it was only the first stage of Susanoo, wasn't it a good start?
The color of his Susanoo was blue-purple. He wondered if it was influenced by Indra Chakra, but Kazuki was quite satisfied with this color.
And after being able to use Susanoo, Kazuki felt that his mental state had stabilized a lot. With a thought, he retracted Susanoo and then began to actively absorb Natural Energy.
"Wait, Kazuki, don't be reckless!" Seeing this, Katsuyu wanted to stop him, but soon, it couldn't utter a word.
After the Natural Energy entered Kazuki's body, it did not cause any damage to him. Instead, it was perfectly controlled by Kazuki, and some changes also appeared on Kazuki's body, with several tomoe shapes appearing on his clothes.
"Sage's tomoe?" Katsuyu widened its eyes.
Kazuki seemed to have successfully mastered Sage Mode. Was it that fast?
Katsuyu had seen such tomoe on the Sage of Six Paths, Indra, and Asura. As for Asura's descendants, Katsuyu had never seen them even on the inheritors of Ninshu.
It didn't know why those tomoe appeared on Indra's clothes. Anyway, the Sage of Six Paths seemed to have those tomoe only after successfully learning Sage Mode, and Asura had indeed learned Sage Mode.
Perhaps Indra's was a heritage from his father's side.
It was unexpected that Kazuki, after successfully learning Sage Mode, would have those tomoe belonging to a Sage.
Kazuki's Sage Mode might be even more perfect than Hashirama's.
After a long while, Kazuki finally opened his eyes. He found that his attire had changed from the traditional Uchiha clan clothing. Under the influence of special Senjutsu Chakra, several tomoe appeared, faintly emitting a white light.
Kazuki was already accustomed to the fact that his attire would change after learning Sage Mode.
Wasn't Naruto's Six Paths Mode also called the Sage of Six Paths's Senjutsu by Madara?
Kazuki was not an ordinary Uchiha, he had already begun to revert to the Otsutsuki.
No markings appeared on his face, but marks appeared on his clothes. Wasn't this reasonable?
Kazuki was quite satisfied with this.
"Kazuki? You, have you learned Sage Mode?" Katsuyu was so shocked that it couldn't speak clearly.
It had estimated that Kazuki could learn Sage Mode and believed that he would eventually succeed, but it hadn't expected Kazuki to master Sage Mode so quickly, and so perfectly.
This was a bit too unbelievable.
"I've temporarily mastered Sage Mode, but it will still take some time to get familiar with it." Kazuki felt his own condition, and a smile appeared at the corner of his lips.
"However, after entering Sage Mode, my strength is not merely a little bit stronger than usual."
"Two years ago, I met a strong person named Bee. I feel that it wouldn't be difficult for me to defeat him now."
Katsuyu sighed with emotion. "You are already very strong. Hashirama at this age was far from comparable to you."
"Even a 20-year-old Hashirama couldn't compare to you."
"Next, I will teach you how to use Sage Art, mainly to research how to infuse Senjutsu Chakra into Ninjutsu."
"We also need to see how long your Sage Mode can be maintained and how much time it takes to enter Sage Mode."
"Even Hashirama cannot directly enter Sage Mode."
"Huh? I remember First Hokage-sama could instantly enter Sage Mode, couldn't he?" Kazuki was surprised.
Didn't Hashirama just clap his hands, absorb all the Natural Energy into his body, and directly enter Sage Mode?
Could it be that his memory was wrong?
Both Naruto and Hashirama were Asura Chakra reincarnations. Wasn't the difference too great?
"Haven't you read the records of Hashirama's Sage Mode training?"
"He used his Wood Release to absorb Natural Energy. Wood Release has a natural advantage in this regard, but Hashirama's own control over Chakra is also very great."
Katsuyu paused and added, "However, this also benefits from Hashirama's strong physique. An ordinary person's physique cannot incorporate so much Natural Energy. Neither the chakra pathways nor the human cells can withstand it."
"Hashirama's early death should be related to his battle with Madara, excessive consumption of Chakra and life force, and also related to this kind of Sage Mode."
"You must not learn from Hashirama."
Kazuki nodded thoughtfully upon hearing this. This was understandable.
After all, Hashirama needed to absorb terrifying amounts of Natural Energy to enter Sage Mode.
Hashirama's Chakra was at an astronomical level, and no one could withstand such a large amount of Natural Energy pouring in at once.
Let alone Hashirama, even if Hagoromo came, he probably wouldn't be able to bear it.
That so-called instant entry into Sage Mode was probably the so-called life-draining mode.
Theoretically, this is reasonable!