A couple closer looks at some of the groups that intrigued me.
Vid 1: High Rollers had a cool internal conveyor belt setup inside their gripper.
Vid 2: Eagle Robotic's gripper had a version using rubber bands to manipulate the grip angle of the inflateable.
Vid 3: Team Spyder had a gripper outfitted with roller blade wheels (motorized?) and a minibot for the extra points.
Vid 4: A member of the Atascadero Greybots is proud to talk about their gripper design.