Let's take a quick look at Miami's Four Factors on Defense in the past 3 seasons (rank in parenthesis).
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Season eFG% TOV% DRB% FT/FTA DRTG
2010-11 .475 (4) .126 (26) .755 (4) .223 (11) 103.5 (5)
2011-12 .479 (9) .158 (3) .739 (10) .200 (12) 100.2 (4)
2012-13 .486 (12) .137 (16) .720 (25) .205 (16) 105.9 (17)So while rebounding has been the biggest issue, it hasn't been the only issue. They've dropped in each of the 4 factors from last season in rankings and %s. They aren't creating turnovers at anywhere near the same rate as last season, and what's significant there is that there is not strong correlation between DRB% and TOV%. Their perimeter defense is clearly not what it was last year. The eFG% and FT/FTA drops go somewhat hand-in-hand. They have no inside presence that either A) contests shots near the basket or B) scares opposing guards into even getting deep into the paint. Generally, good defensive teams that lack an inside presence (see 2010-2012 Heat, 08-10 Cavs) make up for this by having an exceptionally strong and chaos-inducing perimeter defense. Prevent penetration, recover quickly, be disciplined with rotations, cover the WHOLE floor well, and you can create an elite defense. However, as evidenced already by the TOV%, the Heat haven't been doing that.
To compensate, especially of late, we've actually seen Lebron be all over the place on defense (see last night). He's been trying his best to cover for the rest of team, make up for poor recovery, missed rotations, etc. He's putting far too much effort in for results that aren't showing. Miami this season, has been the worst defensive team with Lebron OFF the floor (108.7 DRTG +3.4 LA) that Lebron has EVER played on. They've been so bad that even with Lebron on the floor they're only being lifted to about league average level (Spo's lineups and general team complacency have not helped either), and I'm starting to think that THIS is the catalyst for his stamina issues this season.