The chart on Pierce is interesting because Pierce seems to be one of the few NBA players who is effective pretty much anywhere on the court. I'm surprised Ray shows up here not once, but twice, because he sucks I've been told.
As for Rondo, he's still a pretty bad jump shooter, but if no one covers him (because he can go around anybody who does), then it's an equivalent of a foul shot distance field goal. He should shoot more when he's open from that distance, but confidence is an issue I think.
Despite BOS's offensive problems, it's not for lack of good shooters.