Because people started arguing about naruto vs sasuke, and the convo eventually turned to their role models(people those 2 looked up to). Sasuke always chased after his brother, first to be as good as him, then to become strong enough to kill him, then to destroy konoha for him(his suffering) and now to protect konoha for him. Naruto meanwhile right from the very first chapter looked on at the 4th hokage's statue as something he wanted to achieve for himself. He dreamed of being a hokage and used to point towards the 4ths statue saying stuff like 'just watch me' etc. Then when jiraiya mentioned his resemblance to the 4th he was overjoyed. He set his ideal to surpass the 4th, meeting his dad during the pain arc influenced him furhter.
So its a continuation of naruto vs sasuke, in a way. Which has become quite irrelevant with the latest chapter lOl.