They would've gotten votes on virtue of being in a previous Smash game alone, but you're right that doesn't necessarily mean they were way up there. We know that Bayonetta and Cloud would've been highscorers already though. Maybe Ridley or Inkling were also up there; Splatoon took off really fast and Ridley's always had a fanbase.Maybe Wolf, Snake and Icies but certainly not pichu, young link, squirtle or ivysaur tbh, I doubt those 4 placed highly at all
We already have 10 additions (compared to Wii U with DLC), and the ballot that ended in October 15 led to a proposal in December prioritizing all returning characters. Sakurai probably thought this would cover a large enough chunk of the ballot to be worth focusing on.