this completely discounts the injuries during the last four years, something that's completely out of his control. also out of his control were some of the personnel on the team. dipoto was clearly not reagins in this regard.
could he have done more with what the weak talent pool he had in those four years? maybe, but they were nowhere close to being a playoff contender because there were problems with the team that were out of his control (injured kendrys, poor hitting from pujols and hamilton, a crappy bullpen, underperforming players, etc.).