We said it was fake in a very direct and blunt manner.
No one was going to jeopardize a source because a rabid fanbase demanded specific examples as to why it was fake.
Pretty much. It's terrible how vulgar and awful people treated insiders around that time. Just because they wouldn't openly out their sources or go into much detail because of how obviously fake things are. Seriously, I remember the heat GX got for basically debunking it outright and calling it blurry, yet because they didn't spend several videos on the matter they were accused of getting secret info from NOA because of Jon. That kinda made me lose a bunch of faith in people I thought I knew to be courteous tbh.
The sad part is I didn't even believe it as I seriously thought nobody would have outside of just hope. The two empty slots on that roster box were clear as day and the fact BK was on there made it instantly fake due to how absurd it would be for him to be in the game. I rooted for Issac and Mach Rider too but sometimes you just have to accept fate.
Yet despite all this, freaking Banjo/Kazooie got in the game via DLC anyway which I still refused to believe until I actually was in control of them on their stage, solely due to how much it doesn't make sense to me. But I eventually grew to accept them since they at least fit the game's theme more than Master Chief which just makes me seriously convinced it's an underground meme pick. Now if he was on that Grinch Leak I don't think anyone would have bought it.
What shocks me the most however is that we don't even know who made this. I was convinced like with the 5.00 System Update leak I fell for out of desperation for the Switch's UI to improve, we'd hear from some artist who would go "haha you got pranked" and then gets free followers as a result of it all. (Props to the community for shutting down that bigot Josh Thomas when he tried pulling that stunt with a Smash Switch port, though)
But despite the year gap... Nothing. We don't have any idea who made this and I find that the most spooky/fascinating aspect of it all. Even a whole year later. I'd really like to know why he did it and why he never really came out after it was all proven false. It's so perplexing to me.
In the end though I adore Incineroar as he's one of the loveliest Pokemon designs from all of Gen 7 (though I would have personally picked Primarina), so I was hyped as heck for him to get in anyway. Ken was oddly the one I didn't like as while he made sense in concept he wasn't nearly as fun to play as Ryu. I would have taken Sakura instead.