Since Spurs are playing differently than any other NBA team, it's very hard to compare, where Kawhi Leonard belongs.
Obviously, I'd take him at #1 as a best defender among SF's over Butler, James, Tucker, Allen and Iggy.
As far as scoring goes, if you trade him to any other team, on which, he'll have more FGA and more % of the time ball in his hands, you could see his real effect, as far as scoring goes. Otherwise, it's hard to compare.
You're really comparing a SF to all those players listed, who play different roles, from PG-C? You can do better than that, this is as fake as it gets.