Its true in the sense that they dont know who took the title of Hokage after their death. Like Hashirama doesnt know that his bother took the title hokage not even when theywere together fighting hiruzen. Hasi also doesnt know about Minato or Tsunade. The only ones that know each other as Hokage are Hiruzen and Minato. Minato doesnt know about Tsunade and neither does Hiruzen but im pretty sure what their first thought would be"Why didnt they choose Jiraiya?" . . . . . . but i digress. The point of this thread is to predict that for the next five chapters or maybe seven will be of the Hokages recounting the past startting with Hashirama and ending with Minato. Well probably get the whole 411 on Hashiramas past and his volatile relationship with Madara. You know dont be surprised that this prediction might come true. its not the first time sasuke listens to a long ass story about the villages past from angry biased individuals.