After reading and responding to the threads about the recent anime fillers, I've come to a conclusion on the matter. My short answer is no, I do not think its logical for Hagoromo to have ever had sharingan in the first place. Now its not that I didn't give it considerable consideration either, because I certainly did. At first I thought it made great sense, then later I was torn on the idea. Now, however, I'm fairly certain he never had it in the first place and I'll try my best to convey why I believe this.
TL;DR since this went so long:
Hagoromo having sharingan doesn't make much sense because he was one of Kaguya's first offspring and therefore had more access to her pure DNA than a Modern Uchiha would. Him sprouting a mutated Sharinnegan in the form of a Rinnegan, on the other hand, does makes sense. His son sprouting a mutated Rinnegan in the form of a Sharingan also makes sense because Indra has even less of Kaguya's chakra than his father did. I consider both logical because with each generation Kaguya's charka influence was decreasing in their bloodlines. At that point, however, the DNAs stabilized and the Sharigan stayed in the bloodline, along with Byakugan.
Once the Sharingan was a staple in the DNA, the only way to obtain Rinnegan was to combine the Uchiha Sharingan with the Senju Body DNA. This step could perhaps be bypassed by being a transmigrant, where one could obtain Hagoromo's DNA directly. Yet, we can tell from Naruto's case that even transmigrants who are given his DNA won't unlock Rinnegan unless they have an active Sharingan. The bottom line comes down to Hagaromo's case being far too unique to extend to any modern humans. The rules of the doujutsu changed once Kaguya's chakra influence became so watered down.
Note: In the 4th option of the poll, it should read, 'Nope, but unlocking Rinnegan does require Sharingan'.
First and foremost, Hagoromo is unique. By this I mean no one has ever been born quite like him since. So if ANYONE possessed the capability to skip the Sharingan phase of the Uchiha's doujutsu, it would be him. Its logical, if you ask me, that Hagoromo awakened Rinnegan, and Rinnegan alone, at some point in his life. Not necessarily at birth, but at some point. One could argue that the Sharinnegan portion of Kaguya's chakra, afforded to her by the divine fruit, could not manifest fully in her offspring. Therefore, an incomplete variation of it arose in Hagoromo, that being the Rinnegan.
Now, continuing this line of thought, it would make sense that an offspring of Hagoromo, being of even LESS divine chakra than he was, could not fully possess the Rinnegan in its true form. This might be why Indra only awakened a Sharingan, the DNA was weakened again in a single generation, causing an even more degraded doujutsu to spawn. This time it was in the form of the Sharingan. After this second devolution, the chakra influence stabalized and the Sharingan stayed within the heritage. At this point, however, no one would ever be able to unlock Rinnegan (like Hagoromo did) unless they progressed though Sharingan evolution to do so.
With all that said, I'm a firm believer that Sharingan is a strict requirement to unlock Rinnegan in the MODERN era of Uchiha and Senju. Even acquiring Hagoromo's chakra would not be enough because the DNA is now spread far too thin. Take Naruto for example. He was given a portion of Hagoromo's chakra when he was dying yet he did not unlock Rinnegan, only Sasuke did. Even if Hagoromo's chakra alone was enough to unlock it, no one is attaining that DNA unless they are a transmigrant or they combine the Uchiha Sharingan with the Senju body DNA.
Bottom line? Hagoromo having Sharingan doesn't make much sense. He even states he unlocked both MS and Rinnegan at the same time in the anime yet we never see an MS pattern. That plus the fact he just instantly decides the names of the doujutsu out of nowhere? Like WTF, seriously.
In addition, while Hagoromo unlocked Rinnegan without Sharingan, that is not the case with the modern era. To reach Hagoromo's status, you have to attain both Indra and Ashura's chakra, which means Uchiha eyes + Senju body. Only transmigrants would have direct access to his DNA and potentially skip the Sharingan stage, but Naruto's case shows us that attaining his chakra alone is not enough for a non-uchiha to awaken Rinnegan. Now a Senju implanting an Uchiha's Sharingan might allow them to unlock it, but lets not get too crazy.
Now, continuing this line of thought, it would make sense that an offspring of Hagoromo, being of even LESS divine chakra than he was, could not fully possess the Rinnegan in its true form. This might be why Indra only awakened a Sharingan, the DNA was weakened again in a single generation, causing an even more degraded doujutsu to spawn. This time it was in the form of the Sharingan. After this second devolution, the chakra influence stabalized and the Sharingan stayed within the heritage. At this point, however, no one would ever be able to unlock Rinnegan (like Hagoromo did) unless they progressed though Sharingan evolution to do so.
With all that said, I'm a firm believer that Sharingan is a strict requirement to unlock Rinnegan in the MODERN era of Uchiha and Senju. Even acquiring Hagoromo's chakra would not be enough because the DNA is now spread far too thin. Take Naruto for example. He was given a portion of Hagoromo's chakra when he was dying yet he did not unlock Rinnegan, only Sasuke did. Even if Hagoromo's chakra alone was enough to unlock it, no one is attaining that DNA unless they are a transmigrant or they combine the Uchiha Sharingan with the Senju body DNA.
Bottom line? Hagoromo having Sharingan doesn't make much sense. He even states he unlocked both MS and Rinnegan at the same time in the anime yet we never see an MS pattern. That plus the fact he just instantly decides the names of the doujutsu out of nowhere? Like WTF, seriously.
In addition, while Hagoromo unlocked Rinnegan without Sharingan, that is not the case with the modern era. To reach Hagoromo's status, you have to attain both Indra and Ashura's chakra, which means Uchiha eyes + Senju body. Only transmigrants would have direct access to his DNA and potentially skip the Sharingan stage, but Naruto's case shows us that attaining his chakra alone is not enough for a non-uchiha to awaken Rinnegan. Now a Senju implanting an Uchiha's Sharingan might allow them to unlock it, but lets not get too crazy.
TL;DR since this went so long:
Hagoromo having sharingan doesn't make much sense because he was one of Kaguya's first offspring and therefore had more access to her pure DNA than a Modern Uchiha would. Him sprouting a mutated Sharinnegan in the form of a Rinnegan, on the other hand, does makes sense. His son sprouting a mutated Rinnegan in the form of a Sharingan also makes sense because Indra has even less of Kaguya's chakra than his father did. I consider both logical because with each generation Kaguya's charka influence was decreasing in their bloodlines. At that point, however, the DNAs stabilized and the Sharigan stayed in the bloodline, along with Byakugan.
Once the Sharingan was a staple in the DNA, the only way to obtain Rinnegan was to combine the Uchiha Sharingan with the Senju Body DNA. This step could perhaps be bypassed by being a transmigrant, where one could obtain Hagoromo's DNA directly. Yet, we can tell from Naruto's case that even transmigrants who are given his DNA won't unlock Rinnegan unless they have an active Sharingan. The bottom line comes down to Hagaromo's case being far too unique to extend to any modern humans. The rules of the doujutsu changed once Kaguya's chakra influence became so watered down.
Note: In the 4th option of the poll, it should read, 'Nope, but unlocking Rinnegan does require Sharingan'.
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