The Saints are doing the best thing they possibly can, by going to a more run heavy offense. It'll improve their defense by simply keeping their defense off the field more. With some new talent on the defensive side of the ball, that should be good enough for a defense ranked in the middle of the pack. Will it be enough to get them back to the top of the division? I don't think so, I'm not even convinced they'll improve enough to get out of the NFCS cellar.