I remember reading earlier this year that the reason Murphy didn't see playing time in NJ wasn't *solely* because Avery Johnson hated him. Rather, there was concern that Murphy hadn't fully recovered from injury, and that his legs were shot.
I'm glad Murphy is here, but it's important to remember that he may not be healthy, and he might not get healthy. It's not clear-cut that this is just a case of rust. Obviously, the Celtics and Heat were both willing to gamble otherwise, so that weighs in favor of the notion that he'll be a contributor. However, there's no guarantee that Murphy ever becomes even as good as Mikki Moore for us.