My guess is that the broken finger actually made him more focused and forced him to concentrate more on his playing. Most of the January and early February shows are very good from him. But as the tour wears on, he actually gets more inconsistent (starting with the next show in Landover which, in a cruel twist of irony, is where the soundboards all start popping up). I think after this show in Philly, he probably got overconfident and felt that he didn't need to concentrate as much. I think this is also where the Jack Daniels starts affecting his playing substantially.