Less is surely in top 3 when it comes to raw aim . That guy is a monster when it comes to duels . And also as a player surely he is in the top 5 .
idk man..what is the criteria for best aim cuz yeah alfa,less,suygetsu are all really hard to win a duel against in mid to long ranges but then people like something,jinggg,aspas maybe even zekken are all entries and need their aim to look scrappy to be able to adjust quickly so it doesnt look as clean
if we talking about raw aim there's different types of aim:
sentinels like alfa, less, suygetsu, have calm aim suited for anchoring
duelists like something, demon1, kk, zekken, have quick, snappy, and flashy aim that makes their game fun to watch
duelists like aspas, jingg, mwzera, have consistent duelist aim although not as flashy but flashy =/ good aim (also fun fact they all play on same sens)
and there just general consistent aim demons like Leo, forsaken, shao etc.