Board Thread:Manga/@comment-44086949-20191205133131/@comment-44086949-20191210222540

Attackcjc wrote: Well he had characters like Armin be wrong about stuff before, and Zeke ended up being wrong about stuff too. I get what ur saying, but keep in mind, Eren and Zeke were playing heavy mind games over how "monstrous" their father is. For the most part, Eren was winning, and Zeke wasn't faltering from his original beliefs, so by the end, he was shell shocked by it all. I'm not saying he's definitely wrong at this point, but it is a good 50/50. Usually, writers will have knowlegeable characters be correct about lore-building information, such as there being an ocean outside of the walls, or that the walls are made of hardened titans. Armin was only ever wrong about whose side Eren was on, and Zeke was only wrong about him being able to successfully carry out the attack on the survey corps without consequence.

When these sort of errors occur, they're usually because a lack of further information, and not because of incompetence. In the case of time travel, we don't actually NEED Zeke's statement; we have other supporting information to back this up, but an in-canon statement is even further evidence.