EXCLUSIVE CONTENT Get ESPN+ Trade grades: What's next for Mavs, Kings after Barnes deal?Reinhold Matay-USA TODAY SportsKevin Pelton, ESPN Senior WriterFeb 7, 2019, 04:31 AMClose Co-author, Pro Basketball Prospectus series Formerly a consultant with the Indiana Pacers Developed WARP rating and SCHOENE systemFollow on XEmailThe dealKings get: Harrison BarnesMavericks get: Justin Jackson and Zach Randolph