If Pokken playable status should mean anything, so should Hyrule Warriors playable status.
That's not exactly the point that's being made, as the case is not that "because Pokken, Decidueye gets in Smash" (though, don't get me wrong, a lot of the Decidueye supporters are unfortunately treating it like that).
It's saying one of two probabilities:
A. They chose Decidueye for Pokken since The Pokémon Company has plans to promote it with Pokken just being the first step, which would lead to it joining Smash as well by proxy due to said promotions.
B. Decidueye being in Pokken provides enough of a promotional push needed to give consideration for Smash inclusion just as Movie 20 does for Incineroar and Lycanroc Midnight, since out of
all possible options for an Alola fighter, they chose Decidueye.
Both of which are rather fair assessments, even if Incineroar is the superior choice. :V
I did not see the direct, just red the last couple of posts. And am actually surprised Decidueye was chosen in Pokken. It's a good choice, but now am wondering when they gonna do something with the Water type starters? Regarding the owl, yes I do think he's more likely for Smash now.
What about Empoleon? :V
But in all actuality, Greninja is not yet playable in Pokken either. But the Fire starter of his gen was, forgot the fox witch's name. So in that case, Incineroar could be chosen in Smash instead. It seems logical to me at least. I still favor the Wrester Not-Fighting Type Fire Tiger over Ghost Not-Actually-Flying-But-Still-Flying-lol Grass Owl Archer.
I really wouldn't make a comparison since Greninja and Braixen were two different situations than what's being implied here, but you
do raise an important point that people really need to understand regardless of who they support;
Smash's and Pokken's rosters are NOT reflective of each other; what happens with one doesn't necessarily mean it will happen with the other.
Black/White 2-esque sequels to Sun/Moon, with the main draw being Solgaleo/Lunala having formes with armor that resembles Necrozma.