I wonder if the Grinch stuff had any impact on FP Vol. 2. As I've stated previously, this would be their first chance to revisit characters that were shafted in the base game, and if you look back on past games, it's big backlashes that often precede characters getting in, like Ridley's reveal as a boss or K. Rool's infamous Mii costume.
What's really interesting is that
according to Imran Khan, the decision to make Fighter's Pass Vol. 2 happened at E3 2019. What else happened at E3? A character from said blurry image got in, to a rave reception that
shocked even Nintendo. Now I'm highly doubtful that the remaining characters are gonna be Geno, Isaac, Shadow, Chorus Kids, and Mach Rider, hell I think we'd get two of them at best, but you'd have to be insane to think Banjo's reception had no impact on the second Fighter's Pass.