Let's tackle this one by one.
"The box is clearly designed around a pattern, it can't change"
As I and others have said, yes, there is a seemingly good pattern going on here. However, Music Theory, Blog Theory, Trophy Theory, and literally every other theory has had "patterns" as it''s focal point, but we have no evidence that this is something that cannot change. If you can supply me with some, I will gladly take it, as this is something no one has entertained me on. This pattern is also assuming that there are no characters on the back, either, which is another thing I don't see being talked about at all for some reason.
"It is literally impossible to change the design of the box"
Again, there is no good answer for this other than "Because it can't". Why can't it? What stops it? Because you believe it can't? That is not factual evidence, that is opinion.
"The characters cannot be resized"
This is yet another one no one cares to give me an answer on. The best I've heard is "Because then it would break the theory". So, it's impossible for the theory to be wrong because...reasons, I suppose? The theory has to be right, so it can't be wrong? That's the only argument used against this one.
"The artist(s) clearly knows who's left"
Just like how Music Theory clearly knew who was and wasn't in and only uploaded one song per franchise, yes? If the artists know who's left, then please. answer me this...
Why wasn't Isabelle on the box? To my knowledge, this listing didn't go live until after Isabelle's reveal, did it not? Why would she not be on it, then? Clearly the person knows everyone who's left and what our final reveal schedule is, surely they would know she would need to be on it by now. Even if this point is wrong, it points back to what people saying it can't be redesigned: Isabelle being added later literally proves it can be changed.
Some final points I'll make before wrapping this up...
*Verge has heard of potentially more than Incineroar and Ken. They could be DLC, they could not be. There is nothing that proves it either way right now.
*This is not even an actual box, it is a digital mockup. Key word being mockup, meaning it can, and will, change by release.
*Touting this is as solid as ESRB is really interesting when ESRB had videos, pictures, and multiple corroborated sources. This has ideas from some people on a forum. How on earth is that anything like ESRB? Not trying to be rude, I am legitimately curious about this comparison.