Well he coulda killed kabuto if he wasn't such a good healer when he hit him with his first rasengan. Destroyed all his inner organs if im not mistaken, but kabuto was able to heal himself. He was trying to kill oro, itachi, kakuzu, and diadara. So i wouldn't say he doesn't have killing intent he just hasn't been able to kill off characters with a finishing blow.

Back on topic: Now im interested on seeing what kinda training naruto will go thru since he should be getting the key to his seal soon. Also i wonder if tobi's space jutsu will open the door for nartuo learning the 4ths technique ( i know we have had this disscussion before but how else can u fight someone who can teleport where ever the fuck they want unless you can do the same ). That frog scroll/safe might have alot of secrets held in it intended for naruto when he is ready besides the key to his seal. Hope this ultimate jutsu the 4th couldn't complete is not something rasengan related lol.