Banjo & Kazooie maybe. And the previously cut fighters like Wolf 100% won. But I would personally be shocked if King K. Rool or Ridley came anywhere close to winning that ballot. This close-knit Smash speculation scene is just a tiny portion of the amount of people who watched that Nintendo direct, went on the website that same afternoon to write about their favorite game, and then dipped until the DLC was actually released. Bayonetta 2 had come out that year, so there was recency bias.
Nintendo definitely didn't enter into some huge conspiracy of lying to all of us about what the ballot actually meant, that's silly, but that doesn't mean they weren't biased at all. There were likely some other factors, such as they would only choose a 3rd party character because that would bring in the big hype. Heck maybe even something like combining the votes for Dante into the votes for Bayonetta cuz they couldn't secure Dante or they wanted to sell more Switch games. "Realizable" doesn't mean "the one character we already started" it probably, at least in my opinion, just means "what the analysis showed would net the most money out of the top ten"