Great stuff--a lot of specifics leading to your conclusion which makes me ask yet again, if Duran is as awful as you and almost everyone else says he is, why didn't Tracy or Cora use that amazing bench to keep Duran from dragging this team down (as he clearly must have done according to all the boo birds). He played in all 15 games of one winning streak and all 9 of the other, which means he's a rotten saboteur.
That said, I agree the bench is good and so is Breslow who brought in a lot of guys who have transformed this team despite all the talent still on the IL.
These last two games have convinced me that the Sox really are contenders. They have the 3d most wins in the AL and they are in the same Division with #1 and #2.
Right now I see no real weaknesses on the mound, at bat, or in the field. Further pitching injuries, as you say, are possible, but Houck and Crochet both seem headed back and MRI's say Whitlock and Slaten should also be coming back by September. I think both Anthony and Mead will be back by early September. And how about the kid, Franklin Arias? Story is due back, but his hitting is a big question.