I think they were playing off Rondo for the most part. He was nearly always alone standing above the three point line. They gave him all the time/space in the world to throw those passes to Chauncey for threes and to the bigs for dunks. They also had terrible help defense (either that or they got faked out) so Rondo can get to the hoop at will. I remember Rondo saying to the media once that he never looks at his man - he looks at who's next (i.e., the bigs). It's probably pretty difficult to play off Rondo though. You can't force him to shoot the ball because he's gotten to the point where he refuses to shoot...