That'd only ramp up the asspull allegations on the Nika retcon, i.e. Oda didn't know what else to do with the Gomu Gomu, so he turned it into the Everything-Goes no Mi.
I don't think it's a retcon, cuz it's necessary for Ending
It's just a Theory of mine, so we'll see
Think of it this way, Moria controlled Shadows
And Shadows are Copies of People, and They influence each other
And Luffy was able to Fight Oars/Moria thanks to 100 Stolen Shadows
And if Moria wasn't Defeated before Sunrise, then everyone who lost their Shadows would Die
Because you can't exist under Sunlight without a Shadow born from it
So Final Villain is the one who controls One Piece Reality, He is basically the Narrator
He Controls "Dreams" (Instead of Shadows) & with it, He controls Fate, it's his Story
His Alpha Dreamer is Blackbeard (He is Oars of Story, basically Evil Luffy & Secondary Villain of entire Story/Lore)
And DFs are like his Zombies, with Imu being his Perona, and Man With Burn Scar being his Absalom & Willie Gallon being his Hogback ... etc
How can you beat someone who Controls the Story itself? Controls People's Fate & Dreams?
Just like Luffy was able to Fight Oars/Moria, by Hiding a Portion of History/Dreams from him (Using some kind of Weakness like Salt)
That's what Void Century is, it represents the Part of Story that isn't written by OP God (Final Villain)
And it was turned into Nika DF, only Non-Documented DF
Basically Luffy has now the Ability to escape the Script written by Final Villain
OP World isn't a Realistic World, it can be Modified by anyone, it's the Final Villain (It's God) who is keeping everyone from doing such thing, so that only him can Modify & Rule it, while Luffy's DF represents "Dreams" that escaped this Villain, so it allows Luffy to actually live the way things are supposed to be (A World of Endless Possibilities & where Everyone is Free, and there are no Constraints/Rules)
One Piece Activation represents Sunrise in Thriller Bark, meaning the World cannot Survive it as long as their Dreams are not recovered, Final Villain must be Defeated First
So Sun God DF is basically Dream Version of Nightmare Luffy that was Fueled by Shadows instead
And you can see this when Luffy got tired against Kaidou & then started calling out Names of Kin'emon, Momo, Tama & Pedro to Recharge
They are People who entrusted their Dreams to him
Luffy = Man carrying Dreams of Void Century (Literally)