Board Thread:Theories/@comment-29656914-20160816153927/@comment-27321453-20160816180827

Doubtful. The Quad Titan is most likely a new character (could've even ate Ymir) and Ymir definitely went back with Reiner and Bertolt otherwise why entrust Reiner with her letter and not deliver it herself? It surely was possible with her Titan form agility. Marcel has been dead for a long time now. Bertolt perished recently so we'd only see him in flashbacks from now on.