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The sharingan has devolved since it bloomed 1000 years ago and found its first vessel in Kaguya Otsutsuki and then the Sage of Six Paths. I want to point out that we were introduced to the sharingan from the perspective of a clan on the brink of extinction. While they showed no lack in fighting ability they only managed to display a small percentage of their potential. This is because Hagoromo split the inheritance in two parts. First he divided the body and the chakra of the ten tails and then he split the eyes and body of the vessel. The eyes and body represents the Senju and Uchiha clans. This was a mistake that has caused the sharingan and senjutsu to devolve because these powers are meant to be one. There have been some who have went against the heavens and reunited this power and became something a normal human being could not achieve.
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The original power that began with the chakra fruit is the sharingan and nature chakra. Madera reestablished the mind and body connection of Juubi allowing it to evolve once again.
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Right after Madera made the connection Sasuke made a leap and awakens a rinnegan with tomoe. Now we see it evolving back towards it's original form. This was a step in the right direction and it shows that the power is aggressively trying to reunite its two halves. Technically Sasuke did posses both halves when he captured the tailed beasts.
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So he qualifies as someone who is able to pass it on. Now as destiny carves it's path we have Sarada Uchiha the first pure vessel since Hagoromo.
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The reunion of the eyes and body the original power now grows within her. I think that most followers of the manga realize this and are interested in seeing her development. The legacy of power has found its self in this young flower. She does show signs of potential but when the power begins to bloom the vessel will undergo a transformation which allows for the use of its power. This is the various rikudo modes which are loosely based on Hagoromo because he was the last pure vessel born with the eyes and body of the original. Now Sarada holds that power and I am expecting an evolution of the last evolution which was the six paths power. I'm not saying she will surpass Hagoromo because he was also a 10 jin but she will master the six paths power.
The six paths power is the evolution of the original power available only to those who posses the eyes and body of the original power. Its greater than nature chakra. Its the intelligent energy that molds the cycle of life and death. When I refer to the original power I mean the power of the chakra fruit. The first vessel was Kaguya but she was not a pure vessel. This is why she lost her mind. The first pure vessel was Hagoromo he was born with the original power. Which is why he unlocked a rinnegan on his own. The only person ever to do it. If you can't unlock a rinnegan without outside influence you are not a true vessel. Naruto was not a true vessel. Madera was not a true vessel. Kaguya was not a true vessel. Sarada Uchiha is the heir to the six paths power. The transformation begins when she learns to integrate these two powers.
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