Superstars want to be the final piece of the puzzle. The real appeal of the Mavs' pitch was to guys like DeAndre Jordan, Wesley Matthews and Chandler Parsons who wanted to be bigger pieces in a new puzzle.
Trade exceptions allow for additional roster flexibility in some important situations. For example, they provide an amazing way for teams butting up against the cap or tax to add another piece or two.
Stanley Johnson has showed no fear competing inside, using his strong frame to crash the offensive glass and finish with contact. The Arizona product knocked down a three, mixed in a pair of floaters, and held his own on the defensive end of the floor.
The NBA salary cap is used to maintain a competitive balance and is calculated as a percent of all forecasting Basketball Related Income for the upcoming season.
Beyond the mere benefit of adding a player of LaMarcus Aldridge's caliber to a team already competing for a title, the greatest impact of his signing is how it elevates what's possible for Kawhi Leonard.