[Harangue]

Spoiler for I have a hunch regarding Behemoth:

I'm beginning to think that Erwin, the guy who leads the Survey Corps, is actually the Behemoth Titan. He has roughly the same jawline, and has been all cryptic and oddly pushy as to them reaching Eren's basement. I understand that this is humanity's best chance, but at the same time no other character has been so steadfast and calculating, and has anyone noticed his expression never changes?

I think that perhaps his line about realizing who the real enemy was may have been meant as, "You're one of us." It's obvious he's the one who killed, or ordered the Titans from Episode 15 killed, most likely to keep any information from being discovered. Now, why, you may ask, would some Titan keep the most dangerous soldiers around him at all times? Well, for one, it's a sure way of making sure that so long as he remains incognito, he is well protected. Secondly, as the old saying goes, "Keep your friends close, and your enemies closer." In this way, he is able to keep tabs on all of the most dangerous enemies at any given time, as well as know their tactics and learn of enemy plans they may make and screw up or warn any of his allies accordingly.