There are a couple of obvious answers. Middle Infield - The signing of Mark Grudzielanek on Sunday wasn't a bad one, but I think it's fair to say that a lof of people were hoping for a bigger splash.  In spite of the depth Grudz can provide, is this still the team's biggest weakness? Bullpen - There have been some gutsy performances from some unlikely places this season; Jose Mijares and Bobby Keppel have been pleasant surprises, R.A. Dickey has played his role and Matt...