I think you are taking best scorer too literally.
So you're saying when people are saying best scorer, they aren't literally saying best scorer? I don't think you can take the moniker of "Best Insert Anything" too literally? You're either the best at it or you aren't.
I guess if you're saying Durant is the most all-around capable scorer, fine. But really the best scorer at the end of the day is the guy that's going to score the most. It's not like MVP, there's no ambiguity to the notion that the best scorer isn't the guy that has scored the most.