First of all, anime watchers only, this contains massive spoilers. Everything is based upon the latest manga chapters. You have been warned U_U
This is a far-fetched theory, but nonetheless, the facts go on pretty well with it. If you already knew this, sorry, now's the time i have figured it out XD
1. We know from the very beginning that titans have survived 100 years without food and they don't practically need food to survive. They started eating humans for no obvious reasons, ignoring animals and other forms of life.
2. Then, we have this thing
I think it goes for itself that the look-alike is bigger than anything. So let's say the first is bean and that guy milius is sawney. They were eaten by titans and let's say they died. Keep this in mind. Let's go to another thing.
3. The Titan Shifters
As we saw, to transform into a titan, the shifters have to deliberately hurt themselves. When eren first transformed into a titan, he was wounded in its stomach, but nonetheless ALIVE.
From this point on, we can assume that the people eaten by titans didn't die imediately after they were bitten, ripped or whatever. They were swallowed and, presumably, like eren, stood there, until they may have transformed into titans. I told you it's a far fetched theory
Then comes the question: why are they not shifters?
4. In the latest chapters, hanji said that, according to connie's villagers and the location of the nape, titans could be humans. Then, pixis asked
Unknowningly, pixis might have given the answer. The difference between normal titans and the shifters is that the shifters are not fully assimilated into the titan body, whereas connie's family and villagers have become titans by being assimilated in the titan body.
So, so far we know that:
- titans don't eat humans for their hunger needs
- milius and the other guy may be sawney and bean
- the shifters transform when they hurt themselves
- regular titans are actually humans assimilated within the titan body
From this 4 points, we could deduce that, when they were eaten, milius and the other guy transformed into titans and were assimilated into the titan body, becoming sawney and bean.
Titans can't reproduce, BUT, considering that eaten people can transform into titans, what if this is the reason why titans eat people? To reproduce. We have the ape titan that is coordinating all of them and maybe, having consciusness, he knows about all of that. That's why regular titans don't have a logical mind either..
It's a crazy theory, but the points i mentioned kinda go one with another. Thank you for taking time into reading this wall of text. xD hope you enjoyed reading it.
This is a far-fetched theory, but nonetheless, the facts go on pretty well with it. If you already knew this, sorry, now's the time i have figured it out XD
1. We know from the very beginning that titans have survived 100 years without food and they don't practically need food to survive. They started eating humans for no obvious reasons, ignoring animals and other forms of life.
2. Then, we have this thing
You must be registered for see images
I think it goes for itself that the look-alike is bigger than anything. So let's say the first is bean and that guy milius is sawney. They were eaten by titans and let's say they died. Keep this in mind. Let's go to another thing.
3. The Titan Shifters
As we saw, to transform into a titan, the shifters have to deliberately hurt themselves. When eren first transformed into a titan, he was wounded in its stomach, but nonetheless ALIVE.
You must be registered for see images
From this point on, we can assume that the people eaten by titans didn't die imediately after they were bitten, ripped or whatever. They were swallowed and, presumably, like eren, stood there, until they may have transformed into titans. I told you it's a far fetched theory

Then comes the question: why are they not shifters?
4. In the latest chapters, hanji said that, according to connie's villagers and the location of the nape, titans could be humans. Then, pixis asked
You must be registered for see images
Unknowningly, pixis might have given the answer. The difference between normal titans and the shifters is that the shifters are not fully assimilated into the titan body, whereas connie's family and villagers have become titans by being assimilated in the titan body.
So, so far we know that:
- titans don't eat humans for their hunger needs
- milius and the other guy may be sawney and bean
- the shifters transform when they hurt themselves
- regular titans are actually humans assimilated within the titan body
From this 4 points, we could deduce that, when they were eaten, milius and the other guy transformed into titans and were assimilated into the titan body, becoming sawney and bean.
Titans can't reproduce, BUT, considering that eaten people can transform into titans, what if this is the reason why titans eat people? To reproduce. We have the ape titan that is coordinating all of them and maybe, having consciusness, he knows about all of that. That's why regular titans don't have a logical mind either..
As to why shifters exist, it may be something based on anger. I know, it's stupid, but considering that eren hates titans at its best, annie hates the world, ymir hates her "nightmare" (we still don't know anything on reiner and berthold, though), they might be able to shift because of this anger and hate concept.
It's a crazy theory, but the points i mentioned kinda go one with another. Thank you for taking time into reading this wall of text. xD hope you enjoyed reading it.