http://games.espn.go.com/nba/tradeMachine?tradeId=865dbfeRajon Rondo, Jermaine O'Neal, Avery Bradley, 2012 Clippers 1st round pick
for
Steve Nash, Marcin Gortat, Jared Dudley
Why for Boston:
With Jeff Green out for the season, the lack of depth at SF is glaring, and the Celtics' lack of depth at center was already a huge issue. It's doubtful that Jermaine O'Neal and Marquis Daniels can be counted on for most, let alone all, of the regular season and playoffs. If and when either of those guys goes down, the Celtics will be in deep dung. After this season, the Celtics are looking at a rebuild with Rondo as the clear cut best player. Rondo is the sort of player that can elevate a group of role players to a borderline playoff team, but not a contender. That doesn't bode well for rebuilding.
Slotting in Steve Nash at PG in place of Rondo is both a large upgrade offensively and a large downgrade defensively. Yet, slotting in Marcin Gortat in the starting lineup is a very significant upgrade on both ends of the floor. Furthermore, adding Dudley solidifies and strengthens the bench. Also, both Dudley and Gortat are very useful young roleplayers on reasonable long term deals. Great value either as trade chips or as building blocks moving forward. Giving up Bradley (lots of potential, hasn't done much yet) and the Clips pick (likely to be low after the CP3 trade) is not really giving up that much, but those are still valuable pieces to a team like Phoenix.
Bottom line: the Celtics get one last solid shot at a title while the Big 3 are intact and then they get to dive right into rebuilding next season. This sounds like a much better option to me than what seems very likely -- a clumsy half-rebuild attempt mid-season after health issues / struggles due to depth at the trade deadline this year (much like last season).
Why for Phoenix:
First and foremost, they shed $5 million dollars this season. That's important to a cash strapped franchise like the Suns. Second, they get their point guard of the future. With Aaron Brooks playing overseas and Nash at the end of his career, the Suns have to be scrambling to find their next marketable star. Rondo can be that guy. Because of their financial situation, the Suns can not afford to be a bottom of the league team for a few years while they rebuild. They need somebody to draw fans. Rondo can be that guy. The Suns also get a couple of decent, but not great, assets in Bradley and the Clips pick, but since they are getting the best young player in the trade AND saving money this season and moving forward, they can't complain.
Makes sense for both sides, in my opinion (I know many won't agree with me).