Board Thread:Manga/@comment-5774380-20160808233126/@comment-5774380-20160812194827

I have two conflicting theories about Grisha:


 * 1) He betrayed the Hometown because the didn't share their ideals and fled to the Walls to find a new life away from them.
 * 2) He was sent to retrieve the Coordinate, but after falling in love with Carla and befriending Keith, betrayed the Hometown and began plotting against them in his basement.

What seems to be clear in both cases is that at the time of the fall of Wall Maria, he was no longer an ally of the Hometown (if he ever was). He seemed genuinely surprised and affected by the events of that day, hated the Reiss family for not stopping them, and gave Eren the Coordinate and Titan Shifter powers so he could be able to fight them. He never said where he was going when he left his home earlier that day, so it's likely that he was already on his way to attack the Reiss Chapel. I think he knew that the Hometowners were approaching and wanted to stop them, but he either miscalculated and they arrived sooner than he expected, or Ymir's attack prompted them to rush the mission.

It would be an interesting plot twist if we find out that Grisha gave the Coordinate and Titan powers to Eren not in order to fight the Hometown, but to join them, and that he attacked the Reiss family not due not stopping the Titans, but due to not giving the Coordinate to the Hometowners. Although this doesn't match Zeke's words that suggest that Grisha is indeed an enemy of them. I just say that it would be interesting as a plot twist. :P