Yes, the pre-KJ team was better from a rebuilding standpoint, because it had Larry Nance, whose trade value was much higher than anything on the 2012 Suns' roster. I don't know how the Suns succeeded in outbidding other teams for Chambers, but I doubt anyone thinks that they'll strike gold in the FA market like that any time soon. And I'd say that drafting a player of Hornacek's caliber in the second round is pretty close to a miracle.
That's not my point. The Celtics had a lot of assets before the Garnett and Allen trades.
But the only way they'll get such a piece is through the draft, which is what I was saying.