Board Thread:News and Announcements/@comment-26069039-20150202193409/@comment-3568954-20150210154916

you see that was always what ticked me off. a sharingan is the result of the uchiha's brain releasing special chakra that react to the optic nerves of the uchiha creating an eye with a new light allowing them to see chakra and do all of the other nifty things. since obito temporarily possessed him he had temporarily awakened a sharingan but thats the thing. that chakra entered his brain and as such caused his eyes to awaken a sharingan. logic would dictate that said optic nerves would have had said change permanently. in fact that is exactly what kishimoto should have done. case in point indra and asura did the same thing in a manner of speaking, and according to hagoromo madara and hashirama were no longer transmigrants ie indra and asura's chakra no longer resided in them but non the less they still had each and every power they gained from being a transmigrant. so logically kakashi should have had atleast a regular sharingan