Wow, okay, I’ll do a little recap post because I mixed things up myself until fairly recently and I’ve been relying on different theories to explain, so I can understand that it’s not super clear. x)
From the look of things so far though, the whole theory is that it seems that there were two big conflicts relating to OEGs before Eto was born: one that led to the creation of the CCG and one that led to the creation of V.
So here goes:
1) 100+ years ago, a OEG appeared which led to the creation of the predecessor organization to the CCG:


My personal opinion is that this 100+ years old OEG is the “Nagaraj” that apparently destroyed the city Ayato found:

Because ‘Nagaraj’ means “king of nagas” and, from the explanation here:
In Chapter 131, ‘Naagaraji’ ナァガラジ could be a reference to the Hindu mythology Nāgarāja “King of the nāga” (nāga meaning snakes) and also known in Japanese and Chinese mythology as one of the 8 great dragon kings. Among the Nāgarāja there is Vasuki, a snakegod in Indian mythology who was converted into a dragon king in Buddhism, then renamed “Washu-kichi”
and here:
和修吉(washukitsu) is just the assigned kanji for how Vasuki is pronounced in Japanese. Washuu only uses the first two kanji as a family name, and then whoever the successors are adds the last kanji from Vasuki to their given name.
(ex: Furuta Nimura => Washuu Kichimura)
…we can deduce a possible link between the Nagaraj and the Washuu family

Which would explain why the Washuus (who are ghouls) took the side of humans and created an organization in order to defeat him, even if we currently don’t know what happened and how it ended.
Personal opinion there again, but I’m not so sure this OEG is dead, especially since we learnt there is a way to “remain young” as a ghoul:

And also because there is one character that is associated to snakes, skeleton king and kitsune (kitsune being able to learn how to shape shift when they turn 100 years old).


(More of this theory here)
I’m sure Ishida will tell us more about this at some point, because this OEG is linked to the creation of the CCG and will surely allow us to know about the Washuu family itself, but for now I believe that’s all we’ve got for this part.
2) However Kaneki’s side recently introduced a different OEG, the one who “almost destroyed the CCG” and who apparently** “built the 24th ward”:


And in order to defeat him, it seems that the “V” organization was created (?)…

…along with the development of quinque weapons…

…leading this OEG and his people to the 24th ward.

This OEG most likely was from a time around 50+ years ago (post WW2 if you would), which explains why Kaneki’s side thinks that he might still be around (even if old) to help them and why Ayato was sent down to finding that city.
However, this time, my personal opinion is that this OEG isn’t alive anymore…


Because it was Noro who, after being defeated by V, accepted to help Yoshimura with hiding Eto from them in the 24th ward and because

There is likely more to know about him and Eto’s childhood (and why Noro seemed to agree with Tatara’s plan to make the world “a society for ghouls”?) since Kaneki’s side currently is in the 24th ward anyway.
3) These two events led to the plot of TG
And mostly to Kanou experimenting to create OEGs…

because…

…he intends on breaking the equilibrium, which is why he allied with Aogiri Tree, an organization that wished to change things and make this a world for ghouls instead.

And that’s where we are in the timeline. 🙂
The Washuu family were the first who locked the world into a cage, by building an organization that would later become the CCG we know, because they wanted to defeat a OEG who was apparently threatening them or their position, as well as humans. Then V was created to defeat a second OEG and that’s when the lock on the twisted bird cage became sturdier…

because V became the peace keepers, the ones who strive to protect an “equilibrium” between humans and ghouls, making ghouls the predators and thus the danger to be fought against, all the while making sure that no new OEG would try to destroy the cage.

I don’t know yet the reason V allied with Furuta to turn against Washuu Tsuneyoshi (maybe it was because they found the Washuus weren’t as efficient as before at dealing with “issues” like Eto?), but the V organization most likely is the true villain in TG, the one Eto, Arima, Kanou, Kaneki and even Furuta were/are fighting against…

Hence why, if Kaneki truly is Dragon, Furuta referred to him as his ally (and why he’s helping him with becoming a better leader):

That’s the best summary I think I can give you so far, especially since there is likely to be more that we don’t know for now, so take everything with a grain of salt, especially the part about the possible two rebellions before the time of Eto, Arima, Furuta and Kaneki.
Finally, here are my thoughts as to what I think might happen after the current arc in the 24th ward. 🙂
I really hope it helps, feel free to say if anything is unclear. Have a nice day Anon!

















































