Do the Sharingan dots decide their power/ family tree? In chapter 674 page 9, Madara says that Sasuke is the only one who awakened a Sharingan with straight commas, just like his. After that, he says that there might be a connection between them, something beyond blood.




Does this mean that an Uchiha can be distinguished by their Sharingan? Does this also mean that the power of their eye is decided by the type of commas (tomoe) they have?
I believe what Madara means by "straight commas" is that Sasuke awakened the Eternal Mangekyo Sharingan just like he did. No one in the Naruto series has been shown to possess Eternal Mangekyo Sharingan(s) besides these two, so that must be what he meant.

As for the average Sharingan, 3 commas is the mastered form. However, Kakashi, Obito, Itachi, Sasuke and a handful of other Uchihas have been shown to have those 3 commas in their regular Sharingan. Also, all the Sharingan(s) embedded in Danzo's arm had three commas. So for Madara to say that Sasuke is the only one who awakened a Sharingan with straight commas like him, he couldn't be pertaining to the regular Sharingan, but the Eternal Mangekyo Sharingan.