i think some people forget that up until the 5ks, it was supposed to be that naruto didnt understand sasuke. kishimoto knew that naruto wasnt understanding him when he was claiming that obito brainwashed him and that sasuke would never attack konoha. jiraiyas death gave naruto some insight into how it feels to lose someone close to you which assisted naruto in better comprehending sasukes pain and how it differs from narutos but hearing the truth about the massacre was what finally got naruto to understand that he hadnt actually been looking at sasuke.
before learning the truth:
after:










