Before you claim Morde ADC has a 65% win rate on Champion.gg, please read this.
Champion.gg states his win rate as ADC is just under 65%, but look closely at his % play rate by position - 43.44% ADC and 17.39% Top - only 60.83% games he plays.
That other 40% of games are mostly one's he is the ADC, but performs so poorly he has so few items that Champion.gg doesn't know how to classify him
(edit - it's Riot's API that is assigning these lanes, in part by time spent by location in the game, but clearly by other things as well so as to distinguish between the support and ADC [would like to see a Rioter clarify this], not champion.gg - 40% of his games are still unassigned, so the points still stand.) .
A quick look at lolking here shows that his win rate overall in ranked has been 49-51.5% the past week. Looking at plat elo's like champion.gg is on that graph tells you pretty much the same story as ranked overall, and I can promise you people there know ADC is his only strong role and are picking accordingly.
(Edit 2 - For the record, I think Mordekaiser ADC IS overpowered and some nerfs and power shifting would make him healthier, but he's not game breaking like a 65% win rate would be. This post was about properly interpreting statistics, not his balance.)
(Edit 3 - Thanks RiotJules for confirming on my Reddit post that this is whats going on)
's top OR ADC games were her "winrate" and not both, she'd likely have a very different winrate than she does now.
ADC in that guy's team wins, but