DA traded away basically Big Al for Garnett, Allen, and banner 17. The other players and picks involved didn't help those teams.
Meanwhile Brooklyn sold all of their 1st rounders until 2050 for Joe Johnson, and rentals on Pierce and Garnett.
Then add the recent acquisitions of Thomas, Zeller, Crwoder, Jerebko, Datome, and at least another first for a TE, Rondo, Green, and players just passing through.