I don't know if you guys have taken a look at Jack's advanced stats. They were really spectacular last season.
First shooting: He finished #30 overall in the NBA in 3 point percentage at .404 and had a very strong .499 adjusted field goal percentage. His field goal percentage overall was .466, which are great numbers for a shooting guard. He only scored 12.9 points per game, but he scored efficiently.
What separates Jack isn't the solid shooting numbers, by his upper echelon ball handling stats. In total assists, only 21 players in the NBA had more last season. He was tied for 17th in the NBA in his assist rate per 48 with Lin and Prigioni. In assist to turnover rate, he was tied for 13th overall. In short, he put up efficiency statistics on par with the top 20 among important scoring and facilitating players in the NBA as a third guard.