No, the other bench guys are no better that Pearl on defense, but they're also no worse. What Pearl does well is body up one on one in the post. (Unfortunately, he doesn't box out and get the rebound after that.) What he does very poorly is rotation in the zone, and weak side help (both man and zone). Kenny Hall also bodies up pretty well and does much better at weak side help. He might even block a shot from the weak side. He boxes out well and rebounds extremely well. What he does wrong is occasional cluelessness (goofy fouls, etc); but these lapses have gotten fewer and farther between. In addition, he might even score, or get an amazing put back dunk on top of somebody (as he did in the MS game). The upside is immensely more than Steven.
side note: just for the record: I don't agree with any of the "so and so sucks" posts. I'd take any one of these guys in a pick up game. But... there are some players who are simply overmatched at this level. Some players when given a lot of encouragement build confidence and become less of a liability (note that I say LESS). McBee for example, isn't one of these. Steven is. But the encouragement includes not being yanked out for a single bone-headed play. Let's take two bone-headed plays from our most recent game as example. One player hands the ball in to his teammate, which every sixth grader knows is a no-no. Does the coach blow up? No. Good. Don't crush the kids confidence for one bone-headed play. Another player (after making a nice post move for a bucket; playing solid position defense; boxing out well) makes a move, leaps into the air, looks to pass and seeing no one to pass to comes back down with the ball rather than toss it arbitrarily out onto the court. A bone-headed play? Why, yes! Does the coach blow up? Why, yes! It's an impossible situation for kid 2. No one, but no one, thrives under that. If kid 2 gets the encouragement of kid 1, whom he could destroy on the court in normal circumstances, he becomes a much, much more valuable player than kid 1, and it MAKES THE TEAM BETTER.