killing two of kakuzu's hearts is sort of like killing kakuzu twice. i think that pein bodys should count because they are as hard, or even harder, to kill than actual ninjas. and even though he really didn't kill him, naruto persuaded Nagato to go back to his peace mission which resulted in his suicide of resurecting people. and, in a deep, emotional sense, he killed the inari that hated people and longed for his father, and created the inari that he knows now (I don't care if you don't count that)