User blog comment:Llama919/Possible Beast Titan Identity?/@comment-26056057-20150621092722/@comment-4929778-20150817161954

i think he is an entirely different character, someone with great authority in the homeland. maybe he's living in the walls as a way to communicate with RBA and give them mission updates and cause a whole bunch of destruction (RB did say their original goal was to steal the coordinate and then destroy humanity). maybe they have to bring them back because their mission was done and he was a part of the homeland. that could kinda explain why his titan is big and a monkey.