When you first look at the Pelicans roster, another PF/C (Big) does not jump out as a position of need. Besides having Anthony Davis, the best big in the NBA, the Pelicans have a stretch four in Ryan Anderson and two traditional centers in Asik and Ajinca/Withey (assuming 2 of them get resigned). So theoretically, with some continuity and health, the Pelicans probably have one of the better front lines in the NBA.
However, if the Pelicans want to add some more depth and flexibility to their front line, they need another tweener big on the roster.