Not once in the manga was it ever stated once the Rinnegan is achieved it can't be deactivated but it was stated when an eye is not yours it can't be deactivated so it's kept covered.
Ao
Danzo
Kakashi
Nagato
Obito
Are all perfect examples. You guys are reaching too deep into the realm of speculation and what's worse is that you're still wrong. Madara was shown going from 3T, EMS, to Rinnegan. Him being Edo makes absolutely no difference and no one has posted any evidence stating otherwise. Then we have Madaras going back to EMS to use Genjutsu on the Gokage.
It's very clear Madara can deactivate his Rinnegan. I'm just surprised the manga is over and it's 2017, a whole new generation has begun and people STILL ignore manga facts. Guess there really is no cure for fools.
What manga fact?
The only fact you've stated here is that when the eye is not yours it can't be deactivated, which is true, but where's the fact that Sasuke's eye isn't his in the first place?
If you say his Rinnegan doesn't belong to him, let me hear you say Naruto's aren't his.
And if it wasn't his, in the same manner Kakashi's eyes weren't his, why then didn't Sasuke's and Naruto's power vanish with Hagoromo when he passed over?
What belongs to someone else should fade as soon as the bestower's chakra depletes in the bestowed, right? We saw that with Kakashi Hatake when he'd borrowed Obito's eye-powers.
You also argue that Sasuke can't deactivate his Rinnegan because it isn't his, and then you bring a very vague example to substantiate your argument: stating that a dead Madara could switch back and forth between Doujutsu. Have you halted in your hastiness and thought of the fact he was un-alive and his body had been touched by Kabuto Yakushi?
Additionally, when Madara gets hold of his Rinnegan he never "once" deactivate it. Can you tell me why?
Your argument is just peppered with a pseudo-belief to promote your favorite character.
We've already told you a lot of times, I've lost count, that the Rinnegan is an entirely new eye. When awakened the awakener can't reverse the process.
Your evidence has only been a "dead" Madara and my evidence has been innumerable "alive" Rinnegan users that ever dwelled in narutoverse. They all were never shown deactivating to a Sharingan or normal eyes.
That's why your argument is dead anyways. You're using a "dead" example.
No one disagrees with those examples because they didn't awaken the Rinnegan on their own, so it's a different case from all the Rinnegan users who awakened theirs on their own.
This should be my last attempt at enlightenment. I can feel my wits dying with this thread