Planck69 gave
permission for me to argue here.
I sincerely think both debated endlessly on something out of context. But to begin with, in the
Episode 177 – The Terrifying Combo! Zero and Infinity, when we see the world of darkness being said reflected in Judai's eyes it is not talking about that being the size of the earth, that was Judai's interpretation because that layer of darkness had grown through the earth's collective unconscious. And the size on the mortal plane should not reflect the size of the darkness invading the duel spirit world as well.
First it is good to explain that the world of darkness has existed since before the Big Bang that generated all creation and the stars of the universe themselves.
Henceforth, the explanation that is used
in this scan refers to the universe he was explaining just a few seconds before, and I think the crunchyroll translation is definitely better
regarding this frame. But before I start talking about why it is wrong to scale that layer as an argument for the size of the dimensions beyond the points above, I want to remind y'all that I had already shown that the existence of the first card generating the light that merges into the fragment of darkness, called "gentle darkness", which is said in the movie to have generated a creation of infinite universes. Besides, of course, that this event is a constant in all works of Yu-Gi-Oh.
This is something that has existed as a basic principle since the Duel Monster, even the most recent seasons, it is something that resonates with the Yu-Gi-Oh canon itself, so much so that the creator of the movie explicitly says that the event of infinite universes was about this multiverse being created by light and darkness. Nevertheless, there are still things to be taken into account, first is the fact that the the darkness was invading the realms due to a dimensional rift.
- The sum of the events with the sacred beasts, the light that Takuma Saio was bringing to the universe, and the spark that was Yubel against Judai broke the dimensional barrier around the island, and brought darkness to the mortal world - Episode 177
From here we can interpret that the layer of darkness is a portal to another world, in the simplest way. That's why it was mirroring the earth, but it's good to remember that it would expand much further. It had expanded throughout the entire duel spirit world and existed between all the worlds (universes). Just the fact that it would still grow after the fight against Judai already takes away the question of having just the size of the earth that dimensional gap, because that, as Nightshroud himself said was to return everything to the state before the big bang. And we can see that the darkness that is him, is always referred to as something that precedes everything, he even mentions that the stars were born after the darkness that is what he is.
it is very inconsistent just the idea of reflecting the size of the spatial dilation that led to the darkness "world", which was already the size of the earth
at tha time just to say that darkness "word" has a planetary size, when it is literally said to be bigger than the multiverse when you look at all the quotes from all the canon, and the only thing we can take away is that the darkness was wanting to take the entirety of creation to exist only the void of nothingness/darkness again.
Therefores, there is no difference between the
Darkness and the "Darkness World" to reduce its size and say that it is just something on a planetary scale. And don't forget about my countless pleonasm, Nightshroud makes it very clear that his "world" is something that served as a canvas for the first card that generated the Big Bang.