Australian swimmer Isaac Cooper has been removed from the Dolphins' leadership group. (Dean Lewins/AAP PHOTOS)Australian swimmer Isaac Cooper has been removed from the Dolphins' leadership group. (Dean Lewins/AAP PHOTOS) Credit: AAPAustralian swimmer Isaac Cooper has stepped down from the Dolphins' leadership group after a drinking session at the Commonwealth Games. "Isaac did not attend the final night of the swimming competition or final team meeting in Glasgow which is in conflict with team expectations," a Swimming Australia statement said. "Isaac has since voluntarily stood down from the team's athlete leadership group."