Bulls fan here.  Hello.

I was checking lineup data on basketballvalue, and I was amazed to see the Pacers' lineup of Collison-Dunleavy-Granger-McRoberts-Hibbert has arguably been the NBA's #1 lineup this season, with a +14.2 net rating per 100 possessions and 440 minutes played.  Would've never guessed.

Couple questions:

(1) How have they been so good?  Are they that good?

(2) The funny thing is, when Rush replaces Dunleavy in that lineup, it suddenly turns into one of the league's worst lineups, at -15.5 per 100 possessions in 227 minutes.  The ORating drops from 113.7 to 100.4, and even more odd, the DRating drops from 99.4 to 116.0.  And all this despite Dunleavy and Rush posting similar per36 numbers.  Any idea what's causing the change?  Sorry if these numbers been posted before.