Before that season his highest blocks was 1.3, it also coincided with the injury to Emeka Okafor. Now with Emeka healthy there's less shot blocking opportunities.
Well, that's probably the best theory going.
It definitely makes more sense than a rap on the ol' cranium causing him to stumble around confused and delerious on defense.
It just seems that Okafor, a Center, would be covering the 7' types, while G-Wall should have just as many opportunities blocking shots on the SF-SG types that are easier to block. His minutes are also at career highs.
Your theory seems to make more sense in terms of offense, where he would get more shots with Okafor being out. I'm not sure it translates into defensive shot-blocking opportunity.
But maybe it does.Neal