Why Grisha Yeager and Frieda Reiss is an integral part of Eren and Zeke's journey in Attack on Titan Final season part 2

According to the preview shown at the end of Episode 3, the next episode of Attack on Titan Final season Part 2 is set to feature a revelation to the Yeager brothers, Zeke and Eren.

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Why did Grisha tell Zeke to stop Eren here? This is when manga was in kino phases, everyone loved it, and nobody questioned it then. Any opinions? : r/titanfolk

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