I find it quite intresting how obtio could see what Kahashi could see, given how they have the same physical eyes.

As we know the sharingan evolves into the rinnegan,

the rinnegan has the more op version u might say as you simply just need to transfer ur own chakra to see through that persion as oppose to actually transplanting ur eyes. The same thing how nagato used his pain bodies vision. Not to mention the rinnegan with the chakra can control ur body by force in the same way.

So is this obitio and kahashi sight thing a plot device to reveal madara's control over obito to revealed in future chapters?
Is this a sign that the sharingan evolves into the rinnegan?