Joe Johnson signs with Heat, Harden exerting control in Houston, other buyouts. Plus part 2 of a mailbag, including Rudy Gobert’s ceiling, shortening the NBA season, why is Portland surprising, Bulls’ best outcome this season, starting fives for Team USA vs. Team World, GSW ’16 free agency, which trade from the past would you like to veto, and the best backcourt of all-time, with host Nate Duncan (@NateDuncanNBA) and Danny Leroux of RealGM and the Sporting News (@DannyLeroux).