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They discover that the Attack Titan has never truly obeyed anyone; it has always been guided by future memories, essentially allowing its users to "fight for freedom" across generations.

Zeke Yeager, believing he is in control of the Founding Titan's power, takes Eren through their father Grisha’s memories to "de-program" him. They discover that the Attack Titan has never

Because Eren is the current (and likely final) holder, he has been sending specific memories back to previous holders, including Grisha and potentially Eren Kruger, to ensure his own future comes to pass. The Massacre of the Reiss Family including Grisha and potentially Eren Kruger