Hey, as i remember this is my first theory.
I hope i can explain my theory with good english . Hahaha
Okay lets begin
1st. Flower capital.
You can check this picture first
This is himeji castle
You can check the detail here
And lets check flower capital on wano
Its look similar. My speculation is oda sensei create this story based on story of himeji castle.
2nd Himeji Castle
Himeji castle is located in the Hyōgo Prefecture of japan. Looks familiar name right?
Yeah i think there is relationship between hyogo perfecture with hyougorou the flower.
Maybe someone know about that . Feel free to share here.
Okay lets continue. Himeji castle was given bye tokugawa ieyasu to his son in law
"Following the Battle of Sekigahara in 1600, Tokugawa Ieyasu granted Himeji Castle to his son-in-law, Ikeda Terumasa, as a reward for his help in battle"
I believe yasu based from tokugawa ieyasu.
Yeah we can also see on this
I ve read this chapter about 3-4 times. And after that i write this theory
Yeah there is small note yasu play like tokugawa ieyasu, daimyo and later shogun.
If yasu can escape from this situation he can be the next shogun after orochi death
And also i think orochi castle was yasu palace 20years ago, before orochi revolution plan.
We can found a deep well name O-kiku at himeji castle. Yeah we have same character name at one piece again.
There is a story about this well
Based on this story i think okiku was the traitor. She betray the alliance.
1. Flower capital looks similar with himeji castle
2. Himeji castle located on hyogo prefecture. Its looks related with grandpa hyogorou the flower
3.yasu inspirated from tokugawa ieyasu
4. Tokugawa ieyasu give himeji castle to his son in law.
Maybe orochi was yasu son in law. And yasu was owner of flower capital castle before orochi
5.there's a well name okiku at himeji castle, i believe okiku well story related with character okiku. I think she is the traitor or maybe okiku will be death like the story.
Yeah finally i' ve finish this theory. I hope you enjoy to read my theory and i really apologize with my bad english.