How did Madara come about transplanting his eyes to Nagato? Obviously Madara can't take his own eyes out and then perform surgery on a child. He also had to stay attached to the Gedo Mazou in order to live so it's not like he left his cave. How do you think Madara pulled off transplanting his eyes into Nagato?
Another question, how did Madara get a 3T eye when he had to stay connected to the Mazou, any ideas how he obtained that one eye he had when he met with Obito for the first time?