ONLY a FEW hold a Licence ?? and what would that licence be ??..Where do you get this info from??
The current requirements  for adjudicating are well established ,and if you are  refering to  Championship events, then a Fellowship in the div. one is to judge, is ALL that is needed, and there are THOUSANDS of qualified people world wide that hold that qualif...   normally past Champions ( and past ranked dancers ), at the world class events,are chosen , but not necessarly so...
                  A Members is acceptable for many other style comps (Local, state etc).. and even in some cases, the Assoc. level..