Yeah the last 4 at large teams are selected and then sometimes bumped up or down a seed based on whatever rules the committee has for bracketing. Edit: Ole Miss, Oregon and Akron were all automatic qualifiers, Cal I read was an 11 seed on the curve but got bumped to a 12 for some reason or another....so the last 4 at large teams could have been seeded 13, 13, then St Marys and the team they beat that I've now forgotten were higher than the automatic qualifiers in the seed list