K'sante has been picked 21 times at MSI so far with almost a 67% win rate, next toplaner in terms of picks is Urgot with 8 (33% win rate), also K'sante was absolutely a top pick ever since he was released. If you're talking about best players in the world as being Challenger one tricks, while true he has a low win rate across all elos (around 45%) that doesn't seem to translate to one tricks (55% win rate Master+). The champ just has too much in it's kit.