Why Houston does it: Rockets follow the Heat model of building a team and acquire a big 3 of Harden, Love, and Howard that should contend for titles for years to come. Losing Parsons is tough, but Morey has shown that he can find gems in the draft and free agency. Asik is redundant with Howard next to him, so losing him isn't too much of a blow. I believe the Rockets will be able to find shooters and defenders to surround their nucleus.
Why Minnesota does it: While they deal Love, they add Cousins, who had a higher PER last season and should continue to get better. They also add former lottery pick Thomas Robinson, Aaron Brooks expiring deal, and a first round draft pick. While they have to take on Chuck Hayes' deal, his contract could be valuable next season
Why Oklahoma City does it: The Thunder want to win now. They significantly upgrade the center position by adding Asik to take Kendrick Perkins' minutes and also add a borderline all star in Chandler Parsons. The Thunder give up basically all of their young, potential filled bench warmers, but they need results now
Why Sacramento does it: Potential. Basically 4 lottery picks come their way plus cap relief. Delfino's option can be declined and Sefolosha's deal expires at the end of the season. This gives them a lottery pick at every position, yet they should still be bad enough that they will get another lottery pick in next year's draft. The Kings will be young, but they will have cap space and a world of potential.