The foreshadowing for this moment is more clear in the manga, Notice where Grisha is looking : r/ShingekiNoKyojin

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Mikasa's role in the story was already established from the beginning : r/ ShingekiNoKyojin

The chapter that displays the immense beauty of Attack on Titan's themes Conflicted about Grisha's mysterious past after seeing his memories, Eren re - Thread from Vincent, Bonfire of Gains

List of All Foreshadowings for the Basement Reveal (Update - 3/3) - Forums

Attack on Titan – Page 8 – THE REVIEW MONSTER

Shingeki no Kyojin Season 3 Part 2 Episode 8 Discussion (100 - ) - Forums

Zeke Jaeger, Ank Wiki

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Did Eren die in chapter 137? How did rumbling stop by killing Zeke? If rumbling had already stopped, why did they kill Eren? - Quora

Attack on Titan (Shingeki no Kyojin) manga SPOILERS thread, Enter the Basement, Page 69

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Attack on Titan: Zeke Yeager / Characters - TV Tropes

New Chapter Spoilers] This underrated moment made my heart melt : r/ ShingekiNoKyojin