Devil_Hex
I hope that Fujin & Kakashi established a good friendship with each other. When Fujin learns Medical-Ninjutsu, he should propose to Tsunade the option to seal Kakashi's Sharingan with Medical-Fuinjutsu that will allow Kakashi to activate & deactivate his Sharingan with a seal. When the seal should be activate, Kakashi's Sharingan should become inactive & look like a Blind-Eye & when the Seal gets Deactivated, it should lead to Kakashi's 3 Tomoe Sharingan being active. Kakashi should be able to activate & deactivate the seal with 1-hand Sign. This seal should consume Kakashi's Chakra once a week to stay operational. This should drastically change the Story, when Sasuke defects from Konoha & the 3-year training arc, Kakashi should train himself to such an extent that his Chakra reserves should be equal to Hiruzen & he should be able to defeat S-Rank Shinobi without the Sharingan.