Board Thread:Manga/@comment-27321453-20200806152516/@comment-36307699-20200807115843

TKGriffiths wrote: We don't know which future attack titan memories he's seen. He doesn't seem to have control of what he receives, it's somewhat random just like how shifters seeing previous inheritor memories is random.

What we do know is that he hasn't mentioned seeing anything further than 'that sight', which he saw in this chapter. You might be correct about that. Or perhaps these special powers only work whenever royal blood comes in contact with the host. We do not know how Eren Yeager can do this. It is possible from four years ago, or longer until making physical contact with Zeke Yeager that Eren was getting incoming memories from his future self. After that, Eren Yeager probably now has total control of the Attack Titan powers, along with both Founding and Warhammer as well.