Here I am, flushed with complete victory. I go and open the game as CSA to see what my AI opponent had around the map. I was particularly interested in Longstreets command because it had a big row of green lights on the bottom, yet did nothing to prevent the fall of Richmond on the last turn, despite my besieging it for 3 turns.
For some reason, longstreet's command appears to have a power rating of 117, despite having divisions in the container that look like they should be a minimum of 200 or so. See screenshot.