Both Sasuke and Madara's Sharingan awakened/evolved after they broke their bond with their best friends. I love this parallel. : r/Naruto

How did Madara Uchiha end up with the Rinnegan instead of the Sharingan? - Quora

Why didn't Obito use Kamui to survive Naruto and Sasuke's attack? - Quora

Who do you think will win if its Madara, Sasuke, and Indra vs Hashirama, Naruto, and Ashura if everyone is at their strongest form? - Quora

Here is the continuation of Tobirama's explanations about the Sharingan. As always, he is stating facts : r/Boruto

Who does Madara respect the most? - Quora

Which fight was better? : r/Naruto

What would have happened if Madara Uchiha got trapped in Izanami? - Quora

Sasuke Uchiha (Part II), VS Battles Wiki

naruto - How is Straight Tomoe Mangekyō Sharingan awakened? How is it superior to normal Mangekyō Sharingan? - Anime & Manga Stack Exchange

When did Sasuke awaken 3 Tomoe? - Quora

Sasuke loves Naruto — Why do I ship SNS?