Board Thread:Naruto Discussions/@comment-37594199-20181122223428

Ok so kakashi and his sharingan I know he isn’t an uchiha but this confuses me like when he got his sharingan he instantly unlocked the mangekyo sharigan and it’s eternal state since he met all the requirements but he only reason he didn’t use it was because he didn’t know what it was also next question since he’s not an uchiha using the sharingan drains his chakra but when you unlock the eternal sharingan state it using it will no longer drain you or harm you so why did it drain him to use his sharingan? 