What are your thoughts on how they are related?
Just like Haki, DF Abilities, Genes ... etc can be passed down
The same can be done with Consciousness
Just like when a DF User dies, the Devil inside is transferred to a New Fruit
There are Humans who when they die, their Soul is transferred to a New Human (Just like AoT Titans if you're familiar with that)
Think of them as Living Devils who have the same Life Cycle of DFs but don't have any Supernatural Abilities
However, their Presence is hidden inside the New Host, until they are Awakened under certain conditions
Prime Example is Hakuba who is a someone who Died & got Reborn inside Cavendish
Apparently Hakuba is very Wild & Rebellious, that's why he tries to force his way out constantly
When do Double-Layered Eyes appear? It's when both Hakuba & Cavendish Combine & Fuse
In other words, Double-Layered Eyes indicate that the Person's Will is actually a Combination of Two!
And there are multiple Hints actually
Mihawk's Name is Dracule which is obviously inspired by Dracula & it means both Devil & Dragon
Dracula references his Immortality, Devil references how his Soul works similar to Devil Fruits & Dragon references his Relation to Mary Geoise
Oda even went further & made his Boat literally a Coffin
Gave him Christianity Theme & a lot of Cross References, made him talk in Ancient Tongue
His Animal Companion are Monkeys who learned to Fight by observing so many Wars & Battles
He is clearly Bored & Half-Retired as if he is as old as Rayleigh
And Onimaru explained that Black Blades are forged from a lot of Fights & there is no way Mihawk have more Experience than Roger & Rayleigh, unless ofc he lived more than them.
It's very obvious that Mihawk is actually an Ancient Person, the Hints are Countless
Oda even made Zoro become a Trion Person, cuz that's the only way to gain Buffs as much as someone who lived Twice or Thrice
And not just Mihawk & Cavendish, Imu follows the same Pattern
If you go check Imu's Name in Kanji, you will discover that it's Combination of Adam & Eve
And i have more to say about this, but i will leave it for later
Zunisha is also not just an Elephant, it's actually a Deceased Person who committed a Crime & he was given a Punishment to be reborn & live forever inside an Elephant (Until some Event)
Who are these Humans who can be reborn? What's the common Theme between Mihawk, Cavendish & Imu? It's Knights!
Just like Elbaf is basically Land of Vikings, Wano is Land of Samurai, Mary Geoise is clearly Land of Knights
So these Humans who are getting reborn are from there, it's basically a Special Order of Knights (Akainu confirmed such Group exists)
How is such Immortality possible?
Vegapunk literally spoiled everything recently, but most Fans didn't notice
Vega said that he stores his Knowledge in Vega Records that can be accessed by others
And he also said that Ancient Kingdom were more Advanced
Doesn't this mean that Ancient Kingdom definitely built similar Records before, even bigger one most probably
And then Vega revealed to us that he was born "Smart", so where did he inherit his Intellect?
Obviously from Records of Ancient Kingdom
The same Logic applies on those Immortal Knights
There is a Place that contains their Souls, think of it as Vega Records but for Souls
It's also the place where DFs get recycled after their Users Die (It's like a Satellite for Souls)
Another Hint btw is that Big Mom Homies Eyes turn into Multi-Layered when she feeds them more Souls which indirectly tells us that more Souls = More Eye Layers (Caribou is another Hint as he was shown to absorb people completely, so Oda was foreshadowing how Mihawk, Imu & Cavendish have someone living inside them)
Anyway, i don't want to reveal everything, cuz it requires multiple Mysteries to be explained & put together for people to understand how i reached such Conclusions (Cuz it's much much bigger Lore than people realize)
However what i can say is that there are 20 Immortal Knights (Same number as WG Founders)
Three of them are living inside Mihawk, Imu & Cavendish, others are still Hidden (Think of them as Sleeper Agents)
Others are scattered around the World, waiting to be Awakened to start a certain Event
You wanna know who they are? Go check Knights Introduced so far & how Oda teases their Potential
T-Bone was Hyped by Zoro
Vista was Hyped by Mihawk
Streusen was Hyped by Capone
... etc (You can add Crocodile too)
Oda introduced those Three for example, hyped them & then they made their exit
It's cuz he doesn't want us to focus on their Current Level, it's their Future Role that matters
As for the Place that contains Souls, it's Mary Geoise National Treasure, it's also the Place shown with Giant Straw Hat
And it's near impossible to Access cuz it's literally the Afterlife
Only means to enter it is by the help of Brook (His DF is the Key) or Eternal Youth Operation as Doflamingo attempted