Board Thread:Consensus Track/@comment-3568954-20151011021541

So when Naruto and sasuke fought Kaguya it appears that her Rinne Sharingan used a lot of chakra when she kept fighting them using amenominaka Black zetsu was saying that she shouldn't waist her chakra as it uses a lot of chakra to continue to use it. so its my theory that since she wasn't born with her Rinne Sharingan it uses alot of chakra. kind of like how a non uchiha would use a lot of chakra using the sharingan because they were not born with it. 