User blog comment:Llama919/Possible Beast Titan Identity?/@comment-5774380-20150618200119/@comment-26509561-20150619124605

I think he could have been brain-washed again as upposed to just killing him, but even if he could have escaped the wall, he could have used his titan abilities to do so. Assuming he already had it before he ventured outside the walls...

If he had no where else to go he could have been taken in by the "hometown" or even they altered his memories?

Or perhaps ever since the day he became a titan shifter that "serum" that must have been given to him and made him forget and hasn't got to that point where he remembers. Or surviving outside being in such poor condition he could have forgotten naturally... or maybe he remembers everything and conducted an attack on the wall originally to overthrough the military and the king. Even if he did so, then he really doesn't have a need to do that anymore, which would put him in the most awkward situation humanly possible.

Either way, im being pulled back to the "forgotten" scenario, which could evidently happen... but we just have to wait and see.