User blog comment:Gourgeist/Who Is The Beast Titan?/@comment-201.165.100.215-20141008042722

I think is just one of the original titans, it can't be someone we already know since it contradict two of the most importan things, the first one being the lack of knowlege of the 3DMG as it is mandatory for every recruit that joins the army to dominate the use of it, so it can't be someone from the military or anyone who uses a 3DMG and let's not forget that everyone inside the walls knows about the 3DMG, that alone discards the posbility of the ape titan being someone inside the walls, the other one being that he didn't knew humans spoke the same language as him.