If you can't see the pattern by month, then how about by pre and post all star?
pre allstar game: .457
post all star game: .429
And I think that the discussion about how he compares to other back ups is a bit misleading. Not many other back ups are being asked to play 30 minutes a night. Of all forwards who have played at least 29mp/g this season, BBD is 40th out of 50 in FG%, and the only ones behind him are primarily 3 point shooters (Jamison, Rashard Lewis, etc).
He is 34th out of 50 in rebounding (and the ones behind him are all either small forwards or 3 point shooting power forwards).
Of all the power forwards still in the playoffs who play at least 29 minutes a night, he is last in fg%, last in rebounds per game, last in blocks per game.
And I am not saying this to say that BBD is a bad player. But he is a great 7th/8th man. But for a playoff team with title hopes, he shouldn't be playing starter minutes.