Of course not. But the Heat's problem is rebounding and defense, and alot of the time bad execution of the former causes the latter
For the Heat though, it's usually the opposite. Active defense feeds into their rebounding activity. They're a pretty lazy team for the most part, and it's hard to get them motivated for games. They've been that way for 3 regular seasons now. The problems have been greatly exaggerated. They're nothing that actual effort won't fix.