What woulda happened if

[Sageof7Path]

Itachi had used crow sage mode against nagato when they where both reanimated

 

[Cade]

dat sig tho

 

[FleeOnSight]

I would've said "asspull" and recieved a bunch of negg reps

 

[SumnNarutoRelated]

I think konan is the only known crow sage

 

[SharinganisOP]

Nothing would have changed I would assume. Him having crow sage mode wouldn't really stop him from doing anything he did.