Re: Transplanted eyes confusion (or mistake)
Well I agreed before on the "you cannot de-activate the Rinnegan" but look at this.
Nagato's parents, intent to protect their child for who they believed to be killers, died attacking the Konoha ninja who mistook them for enemy ninja. In his grief, remembering his parents' death since as the first time he felt immense pain, Nagato awakened his Rinnegan for the first time and killed the assailants.
Soon after Jiraiya began living with the orphans, Nagato and Yahiko were attacked by an Iwagakure ninja. The need to protect his friend caused Nagato to unknowingly activate his Rinnegan once again to defend Yahiko, killing the ninja. When Jiraiya found out about this, he decided to train them in ninjutsu.
It is from the wiki caise I am too bored to go lookfor the exact pages in the manga. So if any of the 2 is false then sorry.
If those are true though, when did Madara give his Rinnegan to Nagato?