Why didn't Sasuke become the Ten Tails Pillar Force when Naruto ended the Valley Showdown? In fact, Sasuke lacked the conditions to become a ten-tailed pillar force at that time, as explained below.
In order to become the Ten-Tailed Pillar Force, it is necessary to have a container that carries the Ten-Tailed Chakra, but unfortunately, the Outer Path Golem has been sealed by naruto and the two of them, so Sasuke has to use other means to use the Tailed Beast Chakra.
Many people wonder why naruto and naruto finally fought and since Sasuke used reincarnation eye magic to control the tailed beast, why was it not like Uchiha Ban and Belt Earth, so the ten-tailed human pillar force, so that there should be a certain increase in combat power should be able to quickly suppress Naruto?
In fact, the conditions for Naruto to become a ten-tailed pillar force are still relatively harsh: the shell of the ten-tailed pillar force is to have the shell left after the ten-tailed chakra in the plot is withdrawn, which is the Outer Path Golem. Later, the Chakra obtained after xiao organized the collection of tailed beasts was re-gathered into the Outer Path Golem.
The Outer Path Golem is actually the Divine Tree planted by the previous Hui Ye, and after absorbing chakra later, in order to protect the Transformation of the Hui Night God Tree into a ten-tailed six-way immortal, one of the steps is to be sealed in his own body by the Outer Path Golem, so the first condition for becoming a Ten-Tailed Human Pillar Force is that there must be an Outer Path Golem.
However, before the final battle between naruto and naruto, the outer path golem had already been sealed by the six earth bursting stars as the two sealed the night.
This also deprived Sasuke of the opportunity to become a ten-tailed pillar force, and could only use the chakra of the tailed beast that Susanoo had collected to enhance Susa Nenghu's combat effectiveness.
Seeing this, many people will think, isn't the reincarnation eye able to lift the seal of the six earth bursting stars? When Sasuke unsealed the seal, there would be no Outer Path Golem.
The problem is that after the seal is completed, the Six Immortals have withdrawn the special mark (pictured below) that gave Naruto and the two of them the special seal of the Night of The Night (pictured below), and after the Six Immortals leave, the Two of them will not be able to seal the Night of the Night again, and in terms of strength comparison, the Night of the Six Paths will obviously exceed the ability of the two, and it will be integrated with the Golem of the Outer Path, in this case, Sasuke will not be able to release the Seal of the Night, and it is impossible to release sasuke with the opportunity to become the Pillar Force of the Ten Tails. So Sasuke had to dispel this idea.
In order to achieve the so-called reunion ending, Sasuke lost the opportunity to become the ten-tailed pillar force, after all, Naruto is the male number one, and the difference in strength between the two sides is too obvious and may affect the final direction of the ending.
Sasuke and Naruto ended in a showdown with the two, and Sasuke finally endorsed Naruto's philosophy. It can be seen that in order to achieve a happy ending, Kishimoto is still painstaking in the plot arrangement, and Sasuke wants to change the state of the ninja world and the pattern of Kiba Village does not want to achieve it in a too radical way, and the superposition of these factors makes Sasuke unable to become a ten-tailed pillar force with the help of external forces. Purely theoretically, Sasuke had a chance to become a Ten-Tailed Pillar Force.
After Hui Ye was sealed, he was opened by Uchiha Spot after lifting the seal of the six Earth Burst Stars, and after he actually obtained the Outer Path Golem, the tail beast was stripped out when the Hui Night was sealed.
In this case, as long as Kuro does not sneak up on Sasuke in theory, Sasuke has the opportunity to become a ten-tailed pillar force like Uchiha Spot, the problem is that the final decisive stage of the black jeopard is also sealed in the six earth bursting stars, once Sasuke lifts the outer path golem seal, in fact, the black jedi has a certain probability of continuing to come out and make trouble, in order to avoid repeating the same mistakes, Sasuke gave up the opportunity to become a ten-tailed human pillar force, otherwise in the ideal state Sasuke has the opportunity to become a ten-tailed human pillar force.
And once Sasuke became the Ten Tails Pillar Force, Naruto was basically unable to control Sasuke after the disappearance of the Rokudo Immortal Chakra, once Sasuke successfully suppressed Naruto, kishimoto envisioned the perfect ending could not be achieved, with Sasuke's personality will definitely clean up the core management of Kiba Village, which led to the tragedy of the Uchiha clan due to the decision-making of the Konoha management. In this way, the peacetime period envisioned by Naruto in Kiba Village would be difficult to come, and the ninja world would also be re-embroiled in strife due to the civil strife in Kiba Village.
Finally, the main reason why Sasuke did not become the Ten Tails Pillar Force was that on the one hand, it lacked the necessary conditions to become the Ten Tails Pillar Force, there was no Outer Path Golem, and secondly, the plot needed to give Naruto a chance to achieve a perfect ending. Please forgive me for the place where the analysis is not in place, and if you have other ideas, please leave a message to discuss.