Entering his third year in the NBA, Detroit Pistons center Jalen Duren won’t turn 21 until Nov. 18. The young big man has flashed talent and shown glimpses of becoming a high-level player. He is one of the quickest and strongest big men in the NBA. He is a quality rebounder who has premier rim gravity that is especially beneficial for Cade Cunningham. He’s also a poor defender. Like many other young players, Duren still has a long way to go before becoming a finished product. But Duren must show Detroit signs that he can improve on defense if he is going to have a long-term future with the Pistons.