hi hi hi hello i have been meaning to write this theory since chapter 1013 came out but i have only just got around to it now. welcome to possibly the dumbest idea i've had that could actually be true...
The Gomu Gomu no Mi Awakens! Luffy Saves Wano!
In my fantastically popular Prediction Thread that I wrote after Chapter 1013, there were two events I suggested we could see in the coming chapters: Onigashima falling on Wano's Flower Capital and Luffy's Awakening.
Now, in Chapter 1014, we see that Onigashima is looming over the Wano mainland:
Source: One Piece Chapter 1014 (Shueisha)
And as of Chapter 1015, Luffy is still underwater after losing to Kaido, but is about to be rescued by the Heart Pirates:
Source: One Piece Chapter 1015 (Shueisha)
As of the end of 1016, Yamato is holding off Kaido on the rooftop until Luffy returns. But how does Luffy get up? And will he recover his energy both from losing the fight and from being in the ocean for so long before Kaido manages to defeat Yamato and drop Onigashima on the Flower Capital? And how is he going to get back up there? These two questions can be answered with a single solution: Luffy awakens his Devil Fruit.
Over the course of the series, Luffy has used the Gomu Gomu no Mi as his main means of covering large distances quickly. However, it's unlikely he can stretch all the way up to Onigashima from sea level (if that were the case, he could have quite simply Gomu Gomu no Rocket'd all the way to the top of Zunisha back in Zou). So somehow, a scenario needs to arrive where Luffy can actually reach Onigashima with his Devil Fuit.
I know what you're about to ask.
But Marco, why would awakening his Devil Fruit suddenly allow him to stretch more than his alotted Gomu Gomus?
And the answer is, it doesn't. The amount Luffy can stretch is very much fixed from the moment he eats his fruit, I believe. So, how does he get back up? Law's submarine certainly can't fly him up there. I believe for him to get back up, Onigashima must first come down. The scene with O-Toko and Tenguyama in 1016 where they look up at the sky is a potential foreshadowing of this:
Source: One Piece Chapter 1016 (Shueisha)
It's been a long touted idea in the community for a long time that the Raid on Onigashima will fail, but given the amount of symbolism, prophecy and actual manga time we've spent there (this raid is 10 chapters longer than Marineford and it's nowhere near finishing), it would be a waste of Oda's time to have it fail, especially given that he's been setting this arc up for the better part of a decade.
I hear another question.
If Onigashima falls down, that means the raid fails! Right?
Well. Cast your minds back to Dressrosa, and the fight between Luffy and Doflamingo.
Source: One Piece Chapter 785 (Shueisha)
Doflamingo's Awakening allows him to turn his surroundings to string. It's implied that all Paramecia types that allow the user to take material-based properties (rubber, string, soap etc.) awaken this way. So for Luffy, that would allow him to turn his surroundings into nice, bouncy rubber...
Hold on, here we go.
All Luffy needs to do is reach the Flower Capital before Kaido can defeat Yamato and drop Onigashima. As he comes into contact with the land there (probably the little castle on top of Mt. Fuji, or that big curly tree), it takes on his rubber properties and sends Onigashima flying back into the air whence it came. Or at the very least, softens and delays its landing so citizens can move to safety. And with the extra bounciness from the mainland, combined with Onigashima being closer to him and slightly more in reach, he can catapult himself right back into battle to take down Kaido once and for all.
TL;DR - Luffy bounces Onigashima back up to the sky as it falls.
This might be the ramblings of a crazy person, but I thought I'd ramble at you guys.
Let me know what you think!