Brook said that his Soul Powered-Up after going to Afterlife
After he returned, it became his Body's Power Source & he Unlocked New Abilities
So the idea is that a Soul going to Afterlife & returning makes it more Powerful which in turn also makes the Body more Powerful
Kaidou explained that Awakening is basically your Body/Mind & Powers becoming in Sync
It's basically reaching a Level where Body & Mind can handle DF's Max Potential or enduring Breaking It's Limits
Normal Zoans are based on Beings that exist in OP World
Ancient Zoans are based on Beings that existed in Distant Past & also Little Garden
Mythical Zoans are not from this World, they are Otherworldly Beings
(Calgara's Daughter for example said that She will meet Sun God when She Dies)
Based on this, we can conclude that Mythical Zoans are based on Beings from Afterlife or a Similar Place
And only way for Body to be Powered-Up to handle a Mythical Zoan's Awakening, the Soul must be Upgraded
And as i explained above with Brook, that requires "Death & Rebirth"
That's what makes Mythical Zoans so Rare & Special (And why Vegapunk hinted that they work differently than other Zoans)
So basically, Luffy's Death made his Soul Stronger (Which Powers-Up his Haki), it then made his Body also Stronger. Which allowed Him to Awaken his DF. So expect likes of Kaidou, Orochi & Stronger to turn out Alive & Awakened
Apparently Devil Souls of Mythical Zoans (+Brook's DF) allow Users to survive Afterlife & return from it without losing their DF Powers.
Which doesn't apply to every other DF since Death causes Devil Soul to leave User's Body, as if they are not allowed in Afterlife.
Indicating that Mythical Zoans have Stronger Devils who can survive in Afterlife
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And for some reason, Zoro seems to follow the Same Logic
Apparently, Zoro's Soul is also able to survive in Afterlife & it managed to return just like Mythical Zoans
Indicating that he also got a Soul/Body Power-Up Post-King Fight & he should be able to handle his Next Power-Up (Basically his Awakening)
And tbh, this was Hinted multiple times:
1. Asura is Biggest Indication that Zoro's Soul is not Ordinary, it's so Overwhelming that it becomes Visible
2. Urashima met both Luffy & Zoro and yet he was intimidated by Zoro, it's clear it wasn't just CoC since Luffy is also a CoC User
3. Zoro calling himself King of Hell which is another connection to "Afterlife"
And finally, what i believe is Best Hint which Oda kept repeating throughout entire Story is Zoro's Lack of Direction.
There is something else that also is very bad with Directions, you know what it is? It's a Normal Compass in Paradise or a Log Pose in NW!
It's explained that a Normal Compass works in Four Blues but not in Grand Line
While Normal Log Pose works in Paradise but not in New World
So if Zoro's Compass doesn't work anywhere in the World, it means He belongs "Outside This World"
Zoro's Spiritual Power apparently should belong to "Afterlife", same as Mythical Zoans Devils
That's how he was able to Survive Death just like Luffy (Oda even made their Situation Parallel each other to hint at a Connection)
What should he be able to do now Post-Death? It's possible that Next Time Zoro tries to use Asura, he will Unlock Black Blade.
Meaning a Black Blade is Awakening of Master Swordsmen who returned from Death somehow. Mihawk is literally based on Dracula (Which also means Devil), Introduced in a Coffin & has Christian Theme, so that would explain how Mihawk forged his Black Blade.
