Free agency, the NBA Draft, and trades are the three main ways teams can improve their rosters. In reality, very few teams can bet on free agency to revamp their rosters. The Sacramento Kings are not one of those teams. Even if they wanted to, though, the Kings cannot be players in free agency.  As their cap sheet stands today, Sacramento has one of the most expensive rosters in the league. They project to be a second-apron team, which comes with numerous restrictions. Teams have fought hard to duck the second apron. For example, last summer, Boston, one season removed from winning a championship, traded several core players to do so. Apron teams are confined to using their Biannual Exception or veteran minimum contracts. There are a few players who could be fits in Sacramento at these price points.  Getting a point guard The Kings have needed a point guard since they traded De’Aaron Fox. The Dennis Schroder investment failed .…