The Miami Heat are the defending champions and currently have the best record in the Eastern Conference. But even the best teams have some weaknesses, and the Heat should definitely address these issues in the near future.
The Heat are 18th in the league in scoring defense, allowing opposing teams to score 97.7 points per game—a far cry from the fourth-ranked defense that they were last year.
They're also the second-worst rebounding team and worst offensive rebounding team in the league. The Heat weren't a good rebounding team last season when they won a championship either, but this season, their mediocre rebounding is a major reason why their defensive efficiency is so low.
Fortunately for the Heat, there are a few players in free agency who can help them.