I might have to read the chapters about that Dark Naruto again. But Throughout the whole manga, Not a single hint or action suggest Naruto would go against the village or leave the village. You get it? We clearly see how Sasuke want to go against the village. But not a single hint for Naruto would do it. So in a sense that Dark Naruto shouldn't have exist at all.
lmao. Dude Naruto is more Good than a teddy bear! lol It is biology to to avenge your master or whatever. But he didn't against Nagato. So therefore, Dark Naruto shouldn't exist at all after that point.
What about the times when Kurama manipulated Naruto to usae his powers? Like when he fought against Pain and Minato had to step in to stop him. Or when Oro was intentionally pissing Naruto off? He was never 100% pure good. Sure he stopped himself just once, but does that mean he doesn't have any hatred left in him? There would always come a point when someone would do something bad to Naruto and he would flip out and his hatred will boil out again. Dark Naruto was there to truly "purify" him. You think the Naruto that went berserk on Pain could find piece with Obito?
Basically just shows narutos hatred/darkness/etc, and how things could have been if he was like that, ie giving into his anger/hatred. Shame we don't really see him giving into hatred, like ever; even against pein.