Found this on NBA dot com. Breaks down a lot of team stats halfway through the season. Best offensive 5, defensive etc etc etc
I wont go into too much detail, it's worth a read.
http://www.nba.com/2011/news/features/john_schuhmann/01/20/numbers-game-midseason-report/?ls=iref:nbahpt1
Ironically the most successful 5-man unit for the celtics has been
Nate
Ray
Paul
KG
Shaq
Our best pure offensive unit was this.
Rondo
Ray
Paul
BBD
Shaq
kinda funny, i didnt think nate was better than rondo on D but i guess he is 
I could never truly appreciate these numbers.
I mean, according to this article, Jason Collins is the biggest "defensive difference-maker." That is purely coincidence, as are a lot of these other numbers.
That Nate-Ray-Pierce-KG-Shaq group was part of that historic +26 first quarter against the Hawks.
I guess they are interesting to read and compare, but nobody in their right mind can believe we are a better offensive unit with Baby instead of KG.