Also it is usually typical for the “hardcore mains” to be the ones to stick with a dead spec and disproportionately represent most of the sample size and thus “inflate” overall statistics (this doesn’t matter if you go to percentiles).
If anything the lower represented specs are placed HIGHER on OVERALL charts than they should be since specs like Outlaw/Havoc have tons of FotM rerollers playing with their toes dragging the average down.
This is usually really obvious in other genres like MOBAs with League where very unpopular champions like Aurelion Sol or Singed boast 55% “overall” winrates since their pickrate is ~1% and probably 90% of the people that play them have hundreds of games.