Hold on. *I* think Miami got a good deal in this, too.
They got Jason Williams, which will either give them the back-up point guard that they need to replace Keyon Dooling, or insurance against the loss of Damon Jones to free agency. Jason Williams *IS* a starting-quality point guard.
They got Antoine Walker, who, in my opinion, is best used as bench depth. Walker also can help stretch the defense, giving O'Neal more room to operate in the paint. And if you play Walker at the 3, you get more rebounding defensively than you did when undersized-for-a-3 Eddie Jones was playing at the 3.
You get James Posey, a role player extraordinaire. He gives you good defense at the 3, good shooting, and doesn't demand the ball. He should thrive in a catch-and-shoot situation. I would want him starting at the 3.
To do that, you give up Qyntel Woods, Rasual Butler - who, inexplicably, has struggled in a situation which looks to be tailor-made for him, and Eddie Jones. The loss of Jones is the only real wildcard, because he wasn't out there just for defense and 3-point shooting, but for scoring, explosiveness, and ball-movement. Scoring, explosiveness, and ball-movement are the three things that Posey doesn't bring at the 3.
My evaluation is that, if they use the players they got the way I described, Miami just added to its depth. That's not a bad deal.
What I'm afraid of is Miami putting Walker in the starting line-up, and nuking their chemistry from orbit. But something tells me that's what they're going to do. It won't be as bad as I think it will be, but I still think it won't be as effective as my proposed idea.