How is Kabuto arrogant?
He was one of the first people to acknowlege naruto's potential.While he was beating tsunade he never acted superior to her, he only expressed dissappointment that the person he admired so much had a phobia so pathetic.
And even in part 2 he made efforts to heal sakura from the effects of the KN4 because he KNEW that Orochimaru and him could not take out the akatsuki.
The fact that Kabuto realises that he needed all the help he could get with taking down akatsuki is not arrongance. Not to mention he also gave yamato and company a black book helping them more in what way he could to take down akatsuki.
Plus he also mentioned that Naruto was an inspiration to him, though that scene turned out weird, Kabuto said that he always folowed behind orochimaru never thinking once that he had any chance at surpassing him. Somehow Naruto encouraged Kabuto to surpass his master.