Board Thread:Manga/@comment-5774380-20160908231942/@comment-29966962-20160917081626

So correct me if im wrong but most of coordinate users have been riess family members, that means eating a riess with coordinate powers, you would also gain their memories and influence. so grisha ate frieda, to gain the power, knowing he wouldnt be able to use it properly because the riess bloodline influence, and let another shapeshifter(Eren) eat him. This was Grisha's plan from the beginning, and this is where he went just before his house was destroyed by bertol...:P