I think i got it. The only way for a titan to turn back into humans is to eat a human who is a titan shifter. Maybe that's why they're mindlessly trying to eat humans. It might also mean Eren ate his father who could've been a titan (considering he had the formula to turn eren into one) and...
Did anyone else notice how immediately after they discovered the ape titan, reiner and berth wanted to leave? It's already been confirmed that the ape titan is something they need to get home. I'm pretty sure the person controlling the ape titan is a human from their village.
From 47 we basically learned that
- all humans are still alive in titans
- For some reason a titan needs to eat a human if they ever want to be human again (might be different for different titans)
- Eren most likely ate his father which is why he was never seen again and why he is able to...
Just found some more proof of the ape titan being a human
http://www.mangareader.net/shingeki-no-kyojin/38/22
Basically the ape titan was staying here before he turned everyone in the village into titans
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And that is why when a titan dies there are no human remains left.
Look at these pages and you'll notice as Eren loses his reasoning and says "devour ya", his eyes roll up and his skin merges with the flesh of the titan even more. When annie begins to notice Eren losing his mind she grabs...
The ape titan is a human from outside the walls which is why he did not know what the 3D gear was and is also the reason he asked if they were speaking the same language to that guy.