This is an ignorant comparison. Kakashi has nothing to kill Kabuto. Raikiri is not one shotting anyone, especially Kabuto since he can just regurgitate himself into a new body. You also forgot to take into a count the speed, strength, and intellect that goes into this match up.
Kakashi might par up to Kabuto in technique, but technique doesn't mean shit when your opponent outclasses you physically, mentally, and strategically. Not to mention Kakashi cannot copy Kabuto's body modifications (sound 5 abilities, Suigetsu's kekkei genkai, Jugo's nature DNA), immunity to light and sound base attacks, and sage mode.
Kabuto solos' med diff