I think its the other way round buddy. Rinnegan is not an "extension" of the sharingan. The sharingan is a watered down version of the rinnegan. The rinnegan came before the sharingan.
Oh and if Nagato's eyes were transplanted why doesnt he have the other sharingan abilities.
You must be registered for see links
"So the Sharingan could really get to...the Rinnegan."
Sharingan -> Progression -> Rinnegan
And him not being able to use Sharingan techniques is also another MAJOR reason why it seems he has transplanted eyes. A transplanted eye cannot be turned off or moved 'backward'; For example, Kakashi cannot turn his 3 tomoe Sharingan off, but he's able to move it 'forward' into the Mangekyou Sharingan (though he unlocked that dojutsu himself). There is nothing beyond the Rinnegan so Nagato couldn't 'upgrade' his eyes. But Nagato, like Kakashi, could not move his eyes 'backward' - he couldn't revert them back to the EMS nor could he completely switch them off.
Last edited: