Board Thread:Manga/@comment-29919227-20160909220906/@comment-5774380-20160910001736

I bet Isayama did this on purpose to hide Zeke's identity. In a way, he's just using the classic disguise of beard, mustache and glasses; but his comments about his father, then Eren noticing that he's almost identical to Grisha, and then that photo of Grisha with a blond child who seems to be his son, all point that they are indeed father and son.