In the anime Naruto, the reincarnation eye can be said to be a special ability to stand at the top of all pupils, and in the anime, there are only six immortals, Uchiha Ban and Uchiha Sasuke who have awakened the reincarnation eye, as for the reincarnation eye used by Nagato and Uchiha with the soil, all of them are the pair of Uchiha bane, not their own awakening power (don't say nagato is born with reincarnation eyes).
After the battle between Uchiha Ban and the Thousand Hand Pillar, Uchiha Spot obtained the cells between the Thousand Hand Pillar and transplanted them into his own body, and in Uchiha Ban's later years, in the power of Indra and Asura fused with each other, leading to the Chakra of the Six Immortals, under the influence of this power, Uchiha Spot opened the reincarnation eye (so not all writing wheel eyes can evolve into chakra eye protectors).
Uchiha Ban was already old at the time, so he transplanted the reincarnation eye to the young Nagato, Nagato had the bloodlines of the two families of Vortex and Senjutsu, so he could control the reincarnation eye, and after Payne attacked Kiba, Nagato died of exhaustion, and later Nagato's body was hidden by Konan, and before the Ninja War, Hetu defeated Konan and transplanted a reincarnation eye.
But the power of the samsaric eye is so strong, why did the soil only transplant one of them? First of all, the power of the samsaric eye is very powerful, under the influence of the samsaric eye, the holder is easy to lose himself because of this powerful force, and the choice of transplanting a samsaric eye with the soil is also to maintain a certain degree of sanity, otherwise it is easy to completely lose control of the loss of self.
The second reason is that the soil is still reluctant to the power of shenwei, the ability of shenwei as the most special of all the kaleidoscope writing wheel eyes, but also the only time space ninjutsu, with soil can be immune to many attacks through the ninjutsu of shenwei, and at that time no one knew the principle of shenwei, so when facing the enemy, the ability of shenwei is the most suitable for self-protection.
Moreover, the human pillar force controlled by the belt soil at that time was reincarnated, and the belt soil did not need the ability of the six penns, so only one reincarnation eye was enough, and the summoning of the outer path golem must have a reincarnation eye, only by sealing the power of the nine tailed beasts into the outer path golem, the belt soil had the opportunity to become the ten-tailed human pillar force and launch the infinite moon reading.
The third reason is that the belt soil is unexpected, in fact, the belt soil can transplant two reincarnation eyes, but with the addition of the medicine man, the belt soil changed his plan, only because the belt soil saw the man who was reborn by the medicine man, that is, the Uchiha spot, after all, in the plan with the soil, he did not want to resurrect the Uchiha spot, but the medicine man pocket disrupted his plan.
If Uchiha Spot is resurrected, then he will definitely find his own reincarnation eye, and Dai tu also knows that if Uchiha Spot is resurrected, then the initiative will definitely not be in his own hands, but without the reincarnation eye, he can't control the tail beast, and he can't let himself launch the Infinite Moon Reading, so he chose to transplant one reincarnation eye and hide another one.
It's just that Belt Soil didn't expect that Bai Ji had been monitoring him and found the reincarnation eye he had hidden, and after Belt Soil lost nine tailed beasts, Uchiha Spot successfully resurrected and regained his two reincarnation eyes, although Belt Soil didn't want to see this scene, but this thing still happened, so no matter how many reincarnation eyes he transplanted, the result was the same.
In your opinion, why did you transplant only one reincarnation eye for yourself with soil?