Dante Exum is worth 10 wins??? Based on what? There were 13 guys last year with 10 win shares (in your scenario Exum would have to be above that). Do you want to know what Exum's win shares were? -.1 That means that the Jazz would have won more games last year with a replacement than they won with Exum. But sure, next year he will jump to a top 10 player in the league!
Funny stuff.