Those numbers would be alot more useful if we actually knew how many people are picking the character.
Sol, Ky and Millia are consistently the bottom 3 because of how popular of picks they are among new players. While characters like Venom and Pot who get picked alot less at all levels, tend to have their numbers inflated by the results of specialists.
it'd be interesting to see if characters like Elphelt and Leo were achieving such high average win ratios because they aren't being picked as much by beginners, or if they were able to achieve such high win counts while also being frequently picked. (After all it is Elphelt we're looking at)