Because its >Greatest< of all time not Best. There is a lot greatness points that goes beyond just shooting the head on the videogame. In Counter-Strike, for example, people still put s1mple above Zywoo because of "Cultural Impact".
Yes, KK put china on the map, Aspas put brazil on the map, Tenz put Valorant on the map, sure, and you can put all those names as greater players than Sacy, no problem, but Sacy is still a name to be respected and recognized as one of the greats.
He was the first player to win everything possible in Valorant: VCT Brazil(region), VCT Americas(international league), Masters (international tournament) and Champions (World Championship). He cant do that by just "getting carried", especially when you consider everything his teammates said about him all the time
Even the Fnatic guys never won Champions, while Sacy has both Masters and Champions. No org in this game has both yet, and we're already 5 years into the game