User blog comment:XGlass Reflection/Ch. 54 Review~ Erwin of the Rebellion/@comment-76.208.146.99-20140220002635/@comment-41.233.49.225-20140226192014

There was an article on tumblr about about Gunther's killer and they refer Marco to it, some people still think Marco is alive and a titan ( well i do have doubts though), if check that closely the killer has darker skin than Annie's and Annie would be clearly noticed if used her 3DMG, Reiner and Bertoldt are noticed as they didnt move from their places so I dunno maybe there's another traitor in 104th trainee squad or maybe a character that we still dont know yet