Baby has had 5 rebounds in his last 95 minutes of playing time.
And he's second overall for the year, both in percentage and totals, (behind only KG). Everyone has slumps or times when they're "off', but you don't use those slumps to muddy the big picture.
clover already mentioned it, but you're mistaken. In terms of "per minute" and "rebounding percentage",
BBD is the worst big on our team in terms of rebounding. He's behind KG, Harangody, Shaq, JO, and is tied with Semih, and when Perk gets healthy, he'll be behind him, too (based upon recent and career averages).
In terms of rationalization, tell me which example is rationalizing: 1) somebody pointing out stats over a ten game period -- 1/8th of the season -- which suggest a pattern of sub-par play (relative to NBA peers) and suggesting that a player is struggling and would be better off returning to his bench role; or 2) somebody ignoring those stats (and counteracting them with raw stats, without reference to minutes played), chalking them up to a slump, and arguing that BBD isn't the worst player in those categories. I don't want to put words in anybody's mouth, but example #2 seems a lot closer to rationalization than the first one.
Some more stats: BBD is shooting 40.7% as a starter, averaging 3.8 rebounds in 35.5 minutes. He's averaging 14.3 shot attempts per game as a starter, which would lead all players by a wide margin (Pierce averages 13.1 attempts per game). On the other hand, BBD was shooting 47.7% off the bench, with 5.7 rebounds in 29.7 minutes. Clearly, he hasn't adjusted to his new role very well. He's a valuable bench player, but as a starter thus far, he has stunk.
I understand that BBD is a fan favorite, but overall, he just hasn't played that well in the past 10 games or so. He's been a net positive this year, and has been a consistent contributor, but he's been playing poorly lately, with a couple of exceptions. BBD has shown himself to be not ready for primetime, and I'll be glad when he's our 6th man, rather than our #1 volume shooter.