Here's something I'm open to admit:
Cuphead was way more popular than I gave him credit for.
I honestly didn't believe Cuphead could have reached the sort of influence overseas that he did.
He was made and owned by a small US-based indie studio, he was explicitly based on a historical period of American Animation, and still he ended up getting a Mii Costume, a song, and a set of Spirits in Smash. I guess I didn't do my research enough. As far as US-made indies went, I felt Undertale, Shovel Knight, and the Bit.Trip series were the only qualifies that had a real chance at getting any rep in Smash.