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He's already incredibly skilled with Ninja Tools just by having 3T sharingan. Plus Kamui is blinding him now.
Sharingan Kakashi the "COPY" Ninja sharingan copies jutsu remember?Kakashi doesn't know FTG. That would be such an ass pull.
Using that logic would mean that any 3t Uchiha can use FTG.Sharingan Kakashi the "COPY" Ninja sharingan copies jutsu remember?
this^ if he loses his eye he is going to need ftg.Kakashi should learn it
cause kakashi's such a loser he's never been a geniushe could never learn it plus its a s-rank jutsu that you need to be a genius like minato and tobirama or naruto if you wanna do it alone