on the last page Madara said that he would sacrifice his own child to achieve his goal. It's pretty obvious he was referring Nagato.
"be it close friend, brother or even my own child"
Madara killed his friend to obtain MS. Check
Madara took his own brother eyes and obtained EMS. Check
Madara gave rinnegan to Nagato to revive him in future. Check
Pretty obvious.
"be it close friend, brother or even my own child"
Madara killed his friend to obtain MS. Check
Madara took his own brother eyes and obtained EMS. Check
Madara gave rinnegan to Nagato to revive him in future. Check
Pretty obvious.