It proved something because it proved he's willing to go to a shorter rotation in an important game. Brown is really not counted on for the playoffs anyway. He's only going to see time when there's severe foul trouble or based on matchups.
Bringing in Cassell into the rotation doesn't mean they'll start going to a 12 man rotation or anything. They went with 9 against Detroit and at worst they go to 10 come playoff time.
I 100% vehemenently disagree with this. There is no way Brown would have come here to be a 12th man. He is going to the be the first big man off the bench come playoff time, and he likely will be finishing many games on the court. People forget that he was arguably the best big man on the Bulls last year, but got crunched for PT because they wanted to develop their young guys more, and felt the need to play Wallace to try to prove it wasn't a waste of money.
Yeah, the 12 man rotation is a stretch (and I am possitive Sports Guy was using a bit of hyperbole), but the Detroit game showed absolutely nothing.
The only guys who were not used against Detroit were Brown (who WILL be part of the rotation, but was not ready to play yet) and Scal (who will likely not be on the active roster against a team like Detroit). They actually played a 10 man rotation the other night against Detroit(Pierce, Allen, Garnett, Rondo, Perkins, Posey, T.Allen, Powe, Davis, House). So I really don't see how that game proved anything at all.