Time continued to pass.
The moment their timelines synchronized.
Naruto, hovering high above the moon, had nearly finished exploring the castle where Otsutsuki Toneri lived. More than a day had gone by. He had searched every inch, inside and out, and missed nothing of value or any place hiding secrets. He had even learned plenty of ancient lore known only to the Moon Otsutsuki Clan, such as the circumstances under which Hamura awakened the Tenseigan, how the passage to the moon had been constructed, and who had built it.
The answers could all be found in this castle.
They also confirmed many of Naruto's assumptions from before he came to the moon.
After arriving on the moon, Hamura's personal strength had indeed grown, and he had further developed the power of his bloodline before awakening the Tenseigan, an eye that could rival the Rinnegan. The passage to the moon had also been created by Hamura, using his vast chakra and his understanding of space-time techniques. Since he had left descendants on the moon, he had to ensure that they would have a way to return. With his own power and knowledge of space-time techniques, Hamura could travel between the moon and Earth at will.
But his descendants couldn't do the same.
Basically, only someone who had reached the Six Paths Level and mastered the power of space to its utmost limit could teleport freely. Anyone who lacked either of those things couldn't achieve true dimensional travel.
The scrolls preserved in the castle also described the requirements for creating that special space-time passage, along with what it could do.
After studying them closely, Naruto gained a deeper understanding of space. He believed that once his strength made another qualitative leap, traveling freely between the moon and Earth like Hamura wouldn't be