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The Chicago Bulls have been one of the NBA's stingiest defenses since the arrival of Tom Thibodeau. Last season they led the league in opponents points per game, rebounding and were second in defensive rating, a measure of the opponents points scored per 100 possessions.
This season the Bulls are still among the leagues best, but have suffered a noticeable drop. They are allowing 94.2 points per game, ninth lowest in the league, which is up from the measly 88.2 they allowed last season.
Similarly, their defensive rating has gone from 100.3 to 102.0 which is also good for ninth in the NBA. Finally, the Bulls have seen their rebounding differential drop significantly. Last season Chicago led the league with a plus-6.7, which has dropped to a plus-2.7, seventh in the league.
This drop in defense has been one of the most surprising for the Chicago Bulls. It can partly be attributed to the drop off that now exists defensively between Joakim Noah and his backup, Omer Asik, but it likely comes down to the absence of their floor general.
Either way, the Bulls are still one of the top defensive teams in the NBA, but have seen their stifling defense scored on more this season than anyone is used to.