User blog comment:MeDeoPal/On the Origin of Titans and Shifters/@comment-25233105-20150614070905

My theory is.

1.) Actual year is around 4015CE (source: issue/eppisode 1 title)

2.) Titans (as shifters) were created as a green form of technology (construction etc) (source: speculation)

3.) at some point there was a nuclear event ruining a large part of the planet (source: speculation)

4.) titans use solar energy as well as absorb background radiation (source: speculation)

5.) Titans were mass produced to absorb radiation from the nuclear event. (source: speculation)

6.) Betrayal. First king uses access to project to steal the coordinate, reprogram the "goal" of the titans to eat all humans and accelerate the absortion effect to near instantanious. (source: speculation)

7.) First king uses titans to create the walls and keeps them alive in there to keep absorbing the radiation keeping those inside safe. (source: speculation/manga)

8.) Due to no real account existing so far it is possible initially only 1 wall existed then a second and third was created as the radiation was cleared then peoples memories altered (source: speculation)

9.) In the vague account of how they arrived at the wall many ships were said to have been lost. 1 of these created the colony RBA is from. Protected by the beast titan in some way (source: manga)

I think the reason the first king refuses to act is he fears another nuclear incident. the earth cant handle it. Titans act as a predator keeping humans in check. add to that his MP's suppressing technology keeping things at a level where humans are most fulfilled. (unemployment is low, there are many jobs and automation is low. unlike IRL where there is major automation and not enough jobs to go round) with things to focus on like feeding your family its easy to lose sight of the big picture.

Titan Shifters seem to need a goal and also seem to auto eject when goal becomes impossible or is completed.

I think the mindless titans goal is to "Eat All Humans" this isnt going to happen while the walls are in place but not impossible due to possiblilty of gates opening. (a good reason not to seal the gates) If the walls fell then all of humanity will be wiped out. meaning the titans will be released and the larger part of humanity will be free.

This is the goal of RBA. they feel bad about the killing but have to to save their families (that the beast titant turned into titans) and the millions of humans trapped as titans.

I also suspect eithe eryns mother is an offshoot of the reiss line giving eryn imperfect control of the coordinate but also preventing the first king from dominating him.

and/or

The coordinate somehow needs to be passed via bloodline to be accessed. Grisha took it from another bloodline so couldnt access it or maybe couldnt resist the first kings control for long. But by passing it to his son it unlocked its power to him or he could act as a buffer protecting his son from the king.

In that case it is likely that the first king is resisting eryns attempts to remember older memories or to use shifter powers. but grishas memory is fighting to help eryn. in the basement will likely be information or a serum that will significantly weaken the first kings influence making eryn the true master of the coordinate.