Parsons was better earlier this year, but I think its neck in neck with Leonard having the higher ceiling.
Lebron
Durant
George
Kiwi/Parsons
those are the only notable SFs I can think of tbh so yea top 5 SF isn't really saying something out of the ordinary. Its kind of like how Harden is the best SG, not just because of his talent...but because there aren't many good SGs out there..