Min-Min deconfirmed the Spirits fan rule and Steve deconfirmed the Indies fan rule, and the latter was released after the former. Why are two rule breaking characters so close together? Well, I feel like it's intentional. It's as if Masahiro Sakurai wants to add Shantae, but he is building up to it by shooting down two fan rules at the same time.
Also, it seems like Sakurai is ignoring characters who would otherwise be obvious like Crash and Rayman and is adding characters nobody expects, such as the aforementioned Steve and other less popular names like Banjo, K. Rool, Ridley etc. Aka, Sakurai is adding characters who are hated on for dumb reasons while ignoring characters who are praised nonstop.