Because Verge is the dark lord, happy birthday, yadda yadda.
Jin.
is basically Heihachi right now, so we could give
a villain to fight if Jin gets in.
I could see this sort of happening, Jin is more of an Anti hero than a villain though.
The thing is this argument can be used for a lot of other third party fighters. It's not about advertising the series-ANY third party has the cons of doing that-it's about advertising the specific game, and with KH3 coming up I'm not sure they'd take the dive.
I suppose we will have to see what happens. Either way im excited, whether its Geno,Sora or Erdrick Im excited to see who Nintendo and Square have chosen. And even if Sora does not happen, KH3 will definitely make up for it.