Board Thread:Naruto Discussions/@comment-24898250-20140730025315/@comment-24860855-20140804223132

Officialkamuiblade wrote: What the hell does Sage Mode have to do with Kakashi being able to use Raikiri?! The Raikiri is not a Sharingan jutsu, Kakashi will be able to use it without he Sharingan. Elveonora terminology won't work here people!

Although Raikiri is not a sharingan jutsu it is incomplete without it. Due to the speed at which the user is travelling when using raikiri, they experience tunnel vision. This drawback was primarily solved when Kakashi obtained obito's sharingan which allowed him to see clearly when executing the raikiri.

Sage mode can also solve this problem because sage users are adept in sensing. An example of this is naruto defeating the 3rd Raikage using sage mode to dodge his attack then counterattack all in a matter of milliseconds.

Therefore if Kakashi had sage mode he could detect any counter attacks coming towards him even with tunnel vision, although I highly doubt the possibility of him becoming a sage.