Board Thread:Naruto Discussions/@comment-25100062-20140716145823/@comment-24577388-20140719000427

Ok. First off, yes, Kakashi HAS to keep his eye closed to preserve chakra; that's why he always had his headband covering it. It started eating his reserves the moment he lifted his eyelid. You're right, it ISN'T part 1 anymore; Kakashi had trained himself to handle the eye power much more efficiently than prior to having to constantly fight S-Rank crooks, but he certainly couldn't keep it active for an entire day as you claim he could. Every time he has an opportunity in a battle, he closes his eye to keep himself from passing out later on. He doesn't just keep his eye open the whole time until the fight is over. Furthermore, the war has not been going on for 3-4 days straight; it's currently on it's second day and Kakashi most definitely didn't have his Sharingan active non-stop the entire time. Even during battle, he uses it as sparingly as possible. If he had Sharingan in both eyes, closing one eye at a time wouldn't make a difference because one eye would still be draining him 'til he dropped. He's not an Uchiha; his body is built to handle a dojutsu