So like if Kakashi was dropped from the ANBU and moved to be a Jonin instructor when Itachi left the village. That was a good 6 or 7 years before the start of the show.
And all I can imagine is the hokage going "Be a teacher" and watching 20 year old Kakashi proceed to go Get Fucked Hiruzen I'm Not Doing That and fail every fucking group he's sent for half a decade. Not like Hiruzen will do anything about it anyway.
Kakashi being a Jonin Instructor In Theory for +5 years is just. So funny to me.