Why Wasn't Gragas Put On the Next Champions to Get an Update?

I know Volibear is a popular and fun champ but compare his in game model to someone like Gragas or Zilean. Gragas really deserves a visual update. This isn't coming from someone who plays or has love for the champion, being a support main and has literally only played Gragas once. But why wasn't he put up on the voting poll for champions that needed a visual update at all?
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