Can two Uchiha swap eyes?

No. You need both your eyes and both of your relative’s to unlock the Eternal Mangyekou. They do not swap.

How did Madara get rinnegan in both eyes?

After the battle with Hashirama, Madara loses one of his eyes because of the Izanagi. He awakens only one Rinnegan eye before he dies. But when he got resurrected using Edo Tensei, he has a pair of Rinnegan eyes. Similarly, once he gets his true body back, he has Rinnegan in both eyes.

Who did Madara give his Sharingan to?

Madara had achieved the Rinnegan near to end of his physical life. So he decided that would have to die someday as his body was nearing the end. As a plan to be revived later on, he transplanted his eyes onto an Uzumaki individual. This was Nagato.

What did Madara dream about Uchiha?

Madara dreamt of casting Infinite Tsukuyomi over the world and he only lived for this goal. There is still a lot that the fans don’t know about the legendary Uchiha. Madara had made plans to be reborn when Black Zetsu led him astray.

What happened to Madara after Black Zetsu led him astray?

Madara had made plans to be reborn when Black Zetsu led him astray. He waited for a worthy person whom he would entrust with his dreams, and that guy was Obito. Madara was reanimated, but not by Obito: it was Kabuto who found his body and reanimated him. When he was finally reanimated, he took the Rinnegan and became the jinchuriki of Ten-Tails.

What is Madara’s relationship with Hashirama?

Madara and Hashirama were originally best friends. They had grown tired of the war that had engulfed their childhood and killed their siblings. As kids, both of them envisaged a village where their siblings would be safe.

How did Madara undo the impure world reincarnation?

When Itachi and Sasuke were finally able to defeat Kabuto, they made him undo the Impure World Reincarnation: when Madara realized what had happened, he immediately used the hand seals needed to undo Kabuto’s control over him. The Impure World Reincarnation is a forbidden technique and again Madara proved that he’s a cut above any other shinobi.