This aspect seems to be less widely reported on. Analysts talk a lot in terms of how a team evaluates the depth and distrubution of players in the draft when it come to decisions about trying to move up or down, but that decision is probably driven more by an evaluation of the a team's current roster and their estimates the probability of draft choices beating out an existing player to make the team. Shallow or weak teams need quantity of picks to build depth and because they have a lot guys they don't want to keep, the better/deeper a team, the more you should be willing to give up picks to move up for quality.