Board Thread:Manga/@comment-24407809-20160709015000/@comment-29098965-20160722182745

Grisha attacked Reiss family right AFTER the Wall Maria fell. So at first he promises Eren to show the basement, then the wall is breeched, then the same night he attacks Reiss family, eats Frieda and then goes to Eren to be eaten by him but still asks to find the basement.

Here is the link to the manga: removed*

But I agree that there should be an explanation for why he chose Eren. After all, he was a strong man, he could handle it himself.. I cannot think of any other explanation, than he wanted to hide the coordinate. Cause Warriors attacked the same district he lived in. Their aim was not destroying humanity, otherwise they could do it all the same night. Or no.... maybe they attacked Shiganshina cause Reiss family was living nearby. Another good question is, why Frieda did not fight Grisha? At first I thought that she let herself to be eaten, but now I had an idea, maybe the problem was she was weak? So she would not be able to protect the coordinate from Warriors, who knew where it is hidden (approximately). And this is why Grisha went there swiftly, right after the attack. Not even to his family.

the most interesting question still is - what is there in the basement what Grisha could show Eren at that very early point? Serum? What does it have to do with Eren's question about outside world? He has not seen any titans yet either. Maybe there is something like a map? a map which shows where that so called "Homeland" is located for example. Maybe it is a vast land where shifters (other humans) live? or smth like that. It would answer his question about outside world and it would be still usefull after attack of titans :) However it would be a problem if Eren said it to anyone else. They would have problems with MPs probably :D

* Please don't link to sites with unofficial translations.