Since, madara's 3rd eye and kaguya's 3rd eye are one and the same, this means that there is only one such eye The reason why he only obtained one was because of hagoromo otsutsuki who provided him only half of his chakra, as part of a process to seal kaguya This rinnegan with sharingan tomoe has always been a one eye case from the beginning
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It is very different from madara's rinnegan, which is same as hagoromo's pair of eyes.
So if it wasn't for fan appeal sasuke would have two rinnegan tho having a single red eye does well for disarming a matured sasuke.
The mystery surrounding sasuke’s single rinnegan has captivated naruto fans for years, sparking countless discussions and theories While the series may not have provided a definitive explanation for this asymmetry, the unique properties and implications of sasuke’s dōjutsu have contributed to the richness and depth of the naruto universe. As for why only his rinnegan has tomoe, that is a little harder to derive Sasuke is the only one who awakened the rinnegan through artificial means while hagoromo and madara awakened it naturally.
Why did sasuke get 1 rinnegan instead of 2 Sasuke uchiha received only one rinnegan because he inherited the chakra of hagoromo otsutsuki, the sage of six paths, which awakened the rinnegan in his left eye. The intriguing circumstances surrounding uchiha sasuke’s unique rinnegan have piqued the curiosity of naruto fans Unveiling the intricacies of this unique ocular ability sheds light on certain.
Sasuke acquired the rinnegan through an evolutionary process with his sharingan