Got insane support due to 3 reasons
1.He's the Godfather of video games and a big icon. (He's got a Super Bowl commercial)
2.Myamoto pushed for him in Brawl and inspired him for his video games
3.Right when Bamco was announced that they will help work on the next Smash, guess what everyone thought,
confirmed.
Rayman never had that support until Artsy trolled the whole internet, and even then he had his trophy which was only revealed in a POTD (right before a Smash trailer
)
Same with Banjo who Phil Spencer only said to draw up interest for Banjo but fans took it a mile. It's always been like that. Hint out a character or act like this character is gonna be in and everyone will push for it.