I've made my peace with the box theory a long time ago, even just Verg's supposed SE character would be a nice bonus. Here's how things can play out:
-The "Verg is right, Box is right, and Sakurai told you all to calm down but didn't listen" route aka the Fate Route: Incineroar and Ken are the only ones remaining. It's boring and predictable for most but it's the most likely to be canon. The new SE is NOT Gilgamesh and he gets ****ed.
-The "Verg is only TECHNICALLY wrong but Box is still right" route aka the Unlimited Blade Works Route: same as above except Incineroar is not the only Pokemon and our new Pokemon character is actually another Pkmn Trainer deal, meaning we have 3 new Pokemon. The best case scenario version of the above, it's more interesting and hype and Gilgamesh gets ****ed again except cooler this time.
-The "Verg is right, box is wrong" route aka the Heaven's Feel route: we get Incineroar, Ken and our mysterious SE rep all in the base game. Gilgamesh is still not in and gets ****ed again. Takamaru's corpse is used to summon the SE rep.
And finally
-The "Verg is wrong, box is wrong, Sakurai is a liar" route aka Carnival Phantasm: We get more than 8 newcomers, it's fun and hype but completely non-canon. Gilgamesh is in somehow and Bandana Dee dies.
Also, "content we still need to see outside of newcomers" route aka the "this isn't just about characters" route:
-Spirits Mode
-Stadium Modes
-All-Stars
-Additional game rules
-At least 10 more Assist Trophies
-Many more Pokeball Pokemon
-The other blurred menu option
-Online
-SPIRITS MODE
-Motherfucucking trophies
-Whether or not TW101 music is still in
-All the new FE remixes