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For each comparison I'll be using efficiency in lieu of scoring. Why? Because to use just scoring would be unfair to the Heat. They aren't looking for scoring from everyone. The rest of the teammates beyond the Big Three are role players.
Efficiency differential is a good way to measure the overall role playing because it includes not only the other aspects of the game—like blocks, steals, rebounding and assists—but it also shows how well the defense is performing by comparing it to the opponents'.
For example, the Heat were the lowest-scoring bench in the NBA last year, but they were a long way from being the worst bench in the NBA. They made up for the lack of scoring in other areas. However, it remains true that their bench, overall, is a weakness.
Now granted, there's not perfect shoe size here, but when doing comparisons there's a point where the amount of work needed to do a complete comparison isn't worth the effort it would take. The overall impact would essentially be the same but 30 minutes of research would become five hours of research.
I'm using efficiency because it's easily available, not because there's a deep, dark, ulterior motive.
According to hoopsstats.com, the Heat were 18th in the league in efficiency differential last year, averaging a net negative-2.3 in efficiency. So far this season, while they've acquired Shane Battier, drafted the much-hyped Norris Cole and had a healthy Udonis Haslem, they've been outperformed by a margin of 2.0.
Bear in mind this is against competition that is a combined 1-7. The Heat bench is getting outperformed by marginal benches. Yes, Mike Miller is out, but that's offset by the "strength" of their competition. Opponents are getting 21.4 percent more production from their bench.