Board Thread:Manga/@comment-32563139-20170717125925/@comment-36164949-20180902133401

All titan shifters are connected by paths, so simply, Eren Kruger could see the memories of their past holders and future holders.. Since sometimes Eren Yeager got memories about his father as in the uprising arc, He also mentioned "Memories". We still don't know if titan shifters can see their future holders, but it looks like they can. And Eren Kruger mostly have seen the ​​​​​​​memories of Grisha or Eren Yeager... However its still not  determined if titan shifters could see the memories of the second person who inherited the titan power. So, that's my simple theory, hope that helps you.