It's more spitballing than anything, but it ties together most of what we currently know.
- Incineroar and Ken are locks as far as I am, and everyone else should be, concerned.
- Shadow is not only popular and easy to make, but has had multiple mentions from GameXplain's Jon, who has to have some sort of insider info. I know I said the same thing about Mimique, but this dude called Kirby's Epic Yarn 3DS and every Final Fantasy game coming to Switch. Who does that? Someone with insider info. That's who.
- Steve fits with both Vergeben and our most recent leaker, who was corroborated by Vergeben. This one's somewhat of a tossup, but Steve would be huge. I think we severely underestimate just how big it would be if he were to be in Smash Bros.
- We're definitely getting a Square Enix Rep. We know that much. Who is it? No clue. @「Mega Bidoof」made a good point about there potentially being two Square Enix reps, hence why Vergeben has been so tight lipped, because he's hearing two different names: Sora and Geno.
The only thing that could potentially limit this is box theory,
but, all you'd have to do is remove Shadow and place Sora and Steve on the back of the box like they did for Snake and Sonic in Brawl and it fits. Sora and Steve being on the back of the box makes sense because both are massive third party characters, and would bring people into the game solely via their inclusion, so it'd make sense to highlight them.