There are tons of threads about bad Bargnani's Post D is and the Raps lack of a true defensive presence inside,but that hole wouldn't be so glaring if the Raptors perimeter D wasn't just as horrendous as they're post D was. It's common sense that our big's would have do a better job of protecting the rim if every PG in the league wasn't blowing past Calderon for easy penetration. Demar ,for as much as he is growing on the offense end, still has not learned how to play effective defense yet. One bright spot is that James Johnson has shown potential but I do not think he is a long term answer at SF.
Great teams always have defensive stoppers on the wing, like Artest or Bowen, so the question is what young defensive minded or athletic wing would you go after?